(38 customer reviews)

WEIGHT: 46.7 oz | 1,324 GM
VOLUME: 4,600 CU IN | 75 L
MAX LOAD: 40 LBS | 18 KG

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Our backpacks no longer include hydration sleeve, internal stash pocket, hand loops or water bungie bottle holders. They are available as add-on items going forward, and can easily be added from the cart, or from the Accessories.

The Catalyst remains the tried and true workhorse of the ULA pack line. No matter where the adventure takes you, the Catalyst will be there - ready to carry loads of up to 40 pounds. If you are looking for a pack that will haul a bear canister, or carry your fishing, climbing or photo gear with ease, the Catalyst is an excellent choice. Not only will it carry a good sized load, but it can also be checked as baggage on a plane! The Catalyst has consistently been among the top 5 most popular packs on the Pacific Crest Trails and the Appalachian Trail.

Internal frame with a twin stay framesheet, comfy padded hipbelt, and contoured shoulder straps make for all day comfort even when you're loaded down. Front mesh pocket, dual hipbelt pockets, and Robic adjustable side pockets make it easy to stay organized whether you're on a thru, or just out for the weekend. Weighing only 50 oz – including all the extras! – this pack will lighten you up but still handle the toughest duties.

Now Available in Xpac! Read the "Customization" section below to learn more.

Bottom Line? The Catalyst is a tough and light pack built for traditional backpackers. For more information, please see the short video under the video tab.


  • Internal Frame
  • Twin Stay Framesheet
  • Contoured Shoulder Straps
  • Front Shock Cord
  • Front Mesh Pocket
  • Dual Hipbelt Pockets
  • 400 Robic Adjustable Side Pockets
  • Rolltop Closure
  • Side/Top Compression Straps
  • Ice Axe/trekking pole Retention Loops
  • Bear Canister Capable
  • ULA 400  Robic
  • 400 Robic Bottom Panel


You can customize the color and fabric of your ULA pack! Select "CUSTOM" under the "Pack Color" dropdown above and add your pack to the cart. Then go to our CUSTOMIZER page, select Xpac or Standard fabric, then customize the look of your pack! NOTE: Custom charges are not refundable and returned custom packs will be assessed a $35 restocking fee.


TRAIL NAME EMBROIDERY (+ $15.00): Now you can have your trail name, or your real name, embroidered on your backpack! Not only is it a nice personal touch, but it's a great way of identifying your pack no matter how or where you travel. Simply write your trail name, or your name, exactly as you want it to appear on your pack, in the text field above. Then, choose your thread color and font, and we'll personalize your pack for you. Packs that have trail names embroidered on them are still returnable, minus a $35.00 fee. The cost of the trail name is not refundable.


TOTAL WEIGHT: 46.7 OZ | 1,324 GM *

Listed weight is for a size medium torso with size medium hip belt. Our weights are as shipped including all the removable items.


“Base weight” refers to the total weight of all gear carried — including the weight of your ULA backpack. This weight also includes things like water bottles and food stuff sacks, but not the weight of water and food as this will vary during each trip. Knowing your base weight will help you determine which suspension system will best handle your load on the trail.


TOTAL VOLUME: 4,600 CU IN | 75 L

Breakdown (Cu In):

Main Body: 2,600
Front Mesh Pocket: 600
Left Side Mesh Pocket: 350
Right Side Mesh Pocket: 350
Exterior Collar: 600
Left Hipbelt Pocket: 100
Right Hipbelt Pocket: 100



Catalyst packs are sewn with our new ULA 400 Robic fabric, the toughest stuff ounce for ounce we’ve ever seen.

Colors Available: Original Green, Black, Royal Blue, Teal, Purple


For men, use the waist size of your pants and add 2 inches. The “HIPBELT SIZE” option above includes numbered measurements. The number you calculated (waist size + 2) will determine the size you need. If you are on the outer edge of a size, order the next size up! Example: If you wear a size 36 pant, add 2 to get 38. Since 38 is the last number of the Medium Hipbelt and the first number of the Large Hipbelt, you would want to order a Large.
For most women, measure the smallest part of your waist and add 5 inches. If you are straighter through the hips, add 3 inches instead of 5. The “HIPBELT SIZE” option above includes numbered measurements. The number you calculated (waist size + 5) will determine the size you need. If you are on the outer edge of a size, order the next size up! Example: If your waist size is 26, add 5 to get 31. You would need a Small hipbelt.


Torso measurement is the best guide we have for proper pack fit, but it isn’t foolproof, there are many other factors which will determine a proper fit. If your torso measurement is between 2 sizes, order the smaller size. If you have questions, or your torso size doesn’t seem to make sense for your height, please email and he can guide you along. If you are between sizes on the hipbelt it’s best to go with the larger size, it gives you more padding and puts the pockets in a better position.

To accurately measure your torso length for a correct pack fit, grab a buddy and follow the steps below…

  • Standing upright, tilt your chin to your chest.
  • Locate the largest lump on the back of your neck. It should be located close to the base of your neck.
  • From this large bone, measure (with the flexible tape) down the length and natural curvature of your spine to the top of your waist band, the top of which is resting on the top your hipbone. This measurement in inches is your torso length.


SMALL 15″ – 18″ UNDER 5’6″
MEDIUM 18″ – 21″ 5’6″ TO 6’0″
LARGE 21″ – 24″ 5’10’ TO 6’4″
X-LARGE 24″ + OVER 6’4″

Have any questions or don’t quite fall in the normal range? Give us a call or send us an email!


The J straps are the traditional straps, and work best on most men with average builds. If you are very large in the upper body you might need XL shoulder straps, give us a call for that. Many men with athletic builds, i.e. strong, square shoulders will find the S straps work better. Swimmers, climbers, weight lifters, surfers, triathletes, XC skiers, etc usually prefer the S straps.
The S straps work best on almost all women and men with square shoulders and good posture. If you are a short torso, but with a larger upper body, give us a call, we may want to give you a slightly longer strap, there’s no charge for it, so don’t be shy, pick up the phone or send us an email.


A: “Base weight” refers to the total weight of all gear carried — including the weight of your ULA backpack. This weight also includes things like water bottles and food stuff sacks, but not the weight of water and food as this will vary during each trip. Knowing your base weight will help you determine which suspension system will best handle your load on the trail.


A: The J straps are the traditional straps, and work best on most men with average builds. If you are very large in the upper body you might need XL shoulder straps, give us a call for that. Many men with athletic builds, i.e. strong, square shoulders will find the S straps work better. Swimmers, climbers, weight lifters,surfers, triathletes, XC skiers, etc usually prefer the S straps.
The S straps work best on almost all women and men with square shoulders and good posture. If you are a short torso, but with a larger upper body, give us a call, we may want to give you a slightly longer strap, there’s no charge for it, so don’t be shy, pick up the phone or send us an email.


A: Each side pocket can accommodate two 1-Liter ‘Big Slam’ style bottles. A Nalgene-style bottle will also fit, but in your quest to lighten up, that should have been replaced a long time ago! In general, most people can reach back and retrieve a bottle, drink, and return the bottle to the pocket without removing the pack. The top of the side pockets are angled for easier access and adjust single-handedly with a cord lock and internal bungee to open and close.


A: Yes. Every bear canister on the market other than the Bearikade Expedition will fit into the Catalyst horizontally. Keep in mind it is best to pack something between the hard sided canister and the bottom of the pack.


A: If you are using an inflatable pad, I recommend storing it in the interior of the pack to avoid punctures. A foam pad can easily be secured either behind the front compression shock cord or beneath the top compression strap that goes over the top of the pack.


A: The standard framesheet is comprised of a very dense piece of foam and two ½ aluminum stays which are positioned in a ‘V’ shape. The stays can be bent to give the framesheet a specific contour to your spinal curve. The standard, twin stay framesheet is ideal for loads between 32-40 lbs. It offers plenty of stability and load control within that load range and is well suited for on or off trail hiking.


A: The top of the pack closes like a dry bag (also known as a rolltop) very similar to what river runners use to create a water resistant seal for their gear bags. The back of the collar is slightly taller than the front. Once you are packed, the collar can be rolled down upon itself to effectively create a barrier to water penetration. Once rolled, each side of the collar can be buckled to the sides of the pack or the two yellow buckles on the top can also be fastened to each other.

As for access, once the collar is rolled and fastened shut, you would need to unbuckle the compression straps and unroll the collar to access the inside of the pack. However, the rolltop only needs to be rolled shut when the weather dictates. If the sky is dry, the collar can simply be folded forward. Vertical compression can still be achieved by buckling the collar to the sides of the pack.

38 reviews for CATALYST

  1. Annie Miller

    Great durable pack. Stood up for thousands of miles and has thousands to go n

  2. Leslie (verified owner)

    I needed THE pack for a thru hike of the AT next year. I knew pretty quick the catalyst was the one. I wanted a pack that would hold everything IN it and not hanging off it. I did spend some time working on options and size. (I’m right between small and medium torso.) Peter is so helpful and answered all my questions and helped me decide on size. It arrived a few weeks ago and I couldn’t be happier.
    There is just complete peace with this purchase/pack. My day hikes with it so far have been very comfortable. I will update with a post hike review in the fall of next year.

  3. arno springer

    I have used this pack (Cuben fibre version) for 7 years now on multi-week backpacking trips every summer hiking in northern Canada carrying up to 40 pounds. Very comfortable and has held up incredibly well. Excellent pack, too bad it is not made in Cuben fibre anymore as it is almost .5 pounds lighter. Great pack!

  4. jason stevens (verified owner)

    I’ve had several premium packs throughout the years and this thing is a total jewel! Everything from the craftsmanship to the comfort level is top notch. This is surely a company that stands behind their products. I will most definitely order with ULA again in the future.

  5. Ken Tanner

    I bought a Catalyst last spring on a good hunch, although I had never ever seen one. I kept telling my friends that I was gonna trade in my 40+ year-old pack, that I couldn’t replace any more zipper sliders, and they rolled their eyes.
    I was a little nervous when I opened up the box and the Catalyst seemed so light. On my first overnighter, I never needed or wanted to take it off until I was looking at camp. We spend a lot of time year round on Olympic National Park’s rivers and the Catalyst just swallows my winter stuff…and quickly in the rain like just last weekend. It carries a many-day load well, and it sits behind my body nicely when in off-trail brush. I did add two nice leather lash squares from my beater old pack to the Catalyst top and bottom for an ice axe.
    On a river trip last December, my friend told me they’d liked my new Catalyst so much that she bought one too. She had wanted to surprise me on a future trip, but couldn’t keep the secret. And she was afraid I’d think it was too matchy-matchy. But hers is green and mine is black!
    Thank you for a great backpack!

  6. Andy (verified owner)

    Super happy with the experience of buying my catalyst. I texted a few questions about customizations. Got fast friendly responses from Peter that helped me settled on the details. The pack arrived quickly in a customs not in stock color, under 2 weeks. The grey looks great! Out of the box everything looks very well designed, made and thought out. Under 1300g once I removed a few bits. I have used serval packs over the years, some too minimal to carry bigger loads, some too big & heavy. Expecting the catalyst to be just the right size for longer trips in Yosemite etc. My bear canister and everything else fits without strapping a bunch of junk on the outside. And I have a bit room to help carry stuff for fiends/family too. Excited to get it out on the trails. Thanks ULA

  7. BFK

    Have had this pack for two and a half years. It is fantastic. Lightweight and multi adjustable. Love the spandex outer panel to stow on trail necessities like rain wear. Am a quarter the way through on my goal to hike the AT by age of 70 (I’m now 64) and foresee this pack going the whole way. Thanks ULA for a great product.

  8. Lillers (verified owner)

    It’s really quite amazing how a well-designed pack can make a heavy load feel lighter and comfortable. I’m not a lightweight backpacker and wanted something for about 30-35 pounds. After a conversation with Chris discussing my hiking style, load size and pack carrying preferences, I opted for the Catalyst for more assured comfort thanks to the double aluminum stays and firmer frame sheet. I’m right on the cusp of a Small/Medium frame, but like carrying my pack lower on my hips so opted for the Medium. I probably could have gone either way. I did 6 days on the Superior Hiking Trail with my 75 pound Golden Retriever and no resupply. He eats a lot of food and I like a few luxury items when on trail. The Catalyst performed wonderfully. Our initial load was 32 pounds, but because of the pack design and aforementioned framing system, the weight felt like much less and carried very comfortably.

    Pack Pros: Comfortable…thank you ULA for having the option of “S” straps. Yes, curvy women also backpack. The pack and hip belt straps are perfectly padded, offering comfort without bulk. Multiple adjustment points helped to dial in the perfect, back-hugging fit. There is plenty of interior room, but the roll top and multiple cinch straps allowed me to tighten the load as our food supply dwindled. LOVE hip belt pockets that can carry something other than half a protein bar. I had a day’s worth of snacks in one and my iPhoneX, chapstick, headlamp, buff and sunscreen in the other. Both had room to spare. Side pockets are also amazingly generous as is the front mesh pocket. I really could go on for days about the pack pros as there are many.

    Only one con, but it may just be my body shape. I’m a woman with average sized shoulders, however I feel like the width of the shoulder straps where they are sewed onto the pack body was a bit wide for my frame. Not enough to make shouldering the pack uncomfortable, but enough to notice and requiring frequent adjustments while on trail. Perhaps an option to narrow the strap location points by a few centimeters in the future?

    All that being said, I’m so pleased with the pack I plan on replacing my beloved Osprey Tempest 20 with a Photon or CDT in the very near future for all of my day hiking needs. Bravo to Chris and his team for outstanding quality and superior customer service.

  9. David Mancuso

    Got my Catalyst in 2016 after carrying the Mountainsmith (heavy and outdated) and Granite Gear Blaze (not durable enough). No reason to look further. It fit perfect, out of the box, no adjustment needed. Like other reviews mention, the side pockets are wide and deep enough to be useful, the bladder bag is perfect, outer mesh shove-it is huge and the roll-top is a no brainer. I detest buyer’s remorse. Mission accomplished. Thanks Chris and crew

  10. Alan Lau

    I’ve had my catalyst since 2006. It fits my Berikade expedition canister (vertically), has a large amount of space. Can’t say enough about comfort of carrying a 35 pound load, ULA service. I see others with different brands, including zpaks, osprey, etc… I don’t believe dyneema durabiity beats that of the conventional material in my pack. This pack has been on the PCT, AT, Chattooga River Trail, Foothills Trail, and AZT, so all kinds of terrain and weather. It’s kept my stuff safe and dry. Chris and his gang are fantastic. Nothing but 5 starts for service. They’e repaired some tears in my pack (those of you who have Berikade canisters pay attention to Chris’s advice about padding around the canister: the metal edges are sharp and can, with time, cut the material as well break the carbon fiber stays in the Circuit) (yes I also have a Circuit).. I still prefer the Catalyst to the Circuit on long hikes because I tend to pack my fears. So after 14 years, the shock cord in the rear pocket is loose but that’s easily fixed, the hip belt is wearing away (currently a minor issue but easily replaced) and two snap buckles have broken (also easily replaced). Totally satisfied with this pack. It will last me many more years. I really don’t believe the dyneema packs will last that long.

  11. Stephen Ludden

    The Catalyst …..~on the PCT 2021 a great Backpack…..I will. Be on the PCT , next Year…..2021~

  12. Marc Miller (verified owner)

    Okay here goes… I tried a number of packs and settled on the Circuit for the AT in 2014… Great summer pack for me… I live in Wisconsin and much of my hiking is done during colder seasons and between the volume challenges and frequently carrying over 20lb base weights I decided to go to the larger Catalyst… It was exactly what I needed to do… This pack carries my extras with ease! There is something though I feel seriously needs to be said… There are two aluminum stays (internal frame) inside the pack. It took some doing but with my wife’s help and some trial and error out on the trail I managed to bend them to match the contours of my back… From that point on this pack became magical! I have hiked thousands of challenging miles trying different packs and I can tell you that for me I will never use another pack after customizing the stays on the Catalyst. I am really surprised that nothing is mentioned about custom fitting the frame and believe it needs to be addressed.. Those of you who like this pack will be in heaven if you fit it to your body…

    • Chris McMaster (verified owner)

      Marc, you raise a good point, we do pre-bend the stays so they work for most, but not all people, and I need to get a video out showing how to do it, in the meantime if anyone has a question about bending the stays, call me 435-753 5191 Chris

  13. Namie Bacile

    Founder and first president of ALDHA-West, quadruple triple crowner-
    I enjoy four season hiking, sometimes with my dog or a friend- or both, so I like having a little extra space in my pack if needed. I don’t fear ounces 😉 I pack for pleasure and my average carry weight has been 30lbs for 30+years. I got about 8000m on my Catalyst with only a couple minor repairs needed last year- which is when I found the customer service at ULA was also 5 stars. Comfort and durability is what I look for in a pack and the Catalyst is simply the best pack I’ve ever used.

  14. Chuck Bruffey

    The ULA Catalyst pack is the perfect compromise between the tissue sheet packs and the 6lb full loaders. At 3 lbs, I can get all I need in this pack including a bear can for my typical 7-10 day Sierra trips. Over the three years I have had this pack, it has held up very well with no issues and I am hard on gear! My plan was to get my first day weight under 35 lbs (including scotch) and the ULA pack has helped me meet that goal. This is my fourth backpacking pack from three separate manufacturers so I have some pack experience!

    Highly recommend.

  15. Christa Dierksen

    Love it!!

  16. Sandy

    Bought my Catalyst in July 2011, along with a bunch of other gear that took my son (he bought a Circuit) and me from 52 lbs for 8 days to 32 lbs. Most comfortable and best designed pack I have owned in 60+ years of backpacking. Have carried 45 pounds easily with pack raft, paddle, and PFD. Pack is still in great shape and on track to last as long as I am likely to. I recently compared it to other manufacturers’ packs while deciding what to get for my daughter – Catalyst came out clearly on top.

  17. Tony

    I had been using a osprey aether for about a year until i borrowed a catalyst from a friend for 2 weeks and was instantly in love with the comfort and style of the pack. Not only was it super comfortable but it was over 2lbs(1 kg) lighter than my osprey which is unreal! I decided to order my own semi-custom version and asked advice from Chris from the website. Not only was the response swift and polite it was also very indepth which helped me decide exactly what i needed. I had a deadline to get it ordered in time due to starting the PCT and being from Europe i didn’t have a clue how to use the postal service over here. When i mentioned my deadline the only response from Chris was: We will get it done! As a customer i honestly could not ask for anything more from this company as they really are all-in for the client and professional through and through. The only final thing i call say is thank you, you guys are amazing!

  18. Citizen Z (verified owner)

    i have taken this out on a couple overnights doing 8 miles out and then back. i have carried around 30 lbs including food and water and have found this to be an extremely comfortable pack. I even took it on a 12 mile hike on the highest parts of the Pinhoti trail and it performed flawlessly. I am really impressed. My reasons for buying this was to train for an upcoming Applachian Trail thru hike. I still dont have my gear tuned the way i want but this pack is definitely the one for the colder months when more gear is required.. I sort of wish the side pockets were a little taller, but my crocs have not fallen out anyway. Just me. Great pack

  19. Pony

    After 3,000+ miles of hiking, including thru-hikes of the Colorado and Appalachian trails, I still love my Catalyst.

    In all honesty, if I were buying a pack today, I’d go with the Circuit, which is essentially the same pack, but a bit smaller. But the Catalyst/Circuit are designed so smartly, and are so tough, that either one is a great choice, IMO.

    I’m a big fan of the hip pockets as well as the side pockets, which allow me to reach essentials easily without even stopping (snacks, water bottle, chapstick, Aqua Mira drops, what have you). I strap my REI Z-lite pad to the back of the pack, like a turtle shell, and I use the back mesh pocket for my garbage bag and occasional other items.

    It’s held up extremely well, though I did have to have a pal sew/reinforce one shoulder strap while on the AT.

    Yes, the Catalyst is bigger than what I need now. But it has been perfect otherwise, and after all, I don’t have to fill it up. One day, when it gets retired, I’ll get a Circuit…. but I bet that’s still a long time off.

  20. banneler55 (verified owner)

    I am a bigger guy getting back into backpacking. I spent several hours at REI trying on the limited selection of packs that would fit me. I left discouraged and gave Chris a call. I took the ULA Catalyst out on the trail this weekend. Just a short 4 mile trip. But I have to say, it was like I wasn’t carrying anything. I have had packs since I was a kid in Scouts and never had one that carried like my catalyst. The quality was apparent from the moment I opened the box. But the best part was certainly the fit and carry. I followed the instructions in the video and got a very comfortable position for all the straps. The pack hugged my back and I found myself using the hand loops for quite a bit of the trail.

    All in all, I am so pleased I gave Chris a call and he designed this pack to fit my needs. The pack surpassed my expectations!

  21. Joe

    Wow this is amazing! I can carry everything I need for a weekend of winter rocky mountain backpacking comfortably. It easily fits all my bulky gear like a 0° bag, puffy coat, tent, bear can, etc . This pack blends ultralight and durability perfectly.

  22. Tom Throop

    I agree with everything everyone has said. Best pack ever. Just used for the first time, and the Catalyst functioned perfectly. Very thoughtful design and extra innovations. I am 71 and want to keep up my active wilderness lifestyle. So, I am going ultralight. This is the perfect pack for that purpose. Who ever thought one could get a fully functioning 4200 cu. in. pack weighing 3 pounds. Crazy good. Try Klymit for a pad.

  23. Jake – Suds AT ’12

    Best pack ever. Got this from Mountain Crossings, GA the day before my Appalachian Trail thru hike in 2012. Never regretted it and has been used very regularly for 6 years.

    I’ve done quite a few trails with this absolute warrior comfortable beast of a pack – Appalachian Trail ’12, the Via Francigena in Tuscany ’14, John Muir Trail ’15, Oregon Coast Trail and Timberline Trail 2016, a week on trails in Gran Canaria as well as tens of transatlantic flights and mini holidays living out of it (so much space, but can also be tightened up to a small pack with straps).

    After approx. 3000 miles with typically around 25-35lb pack weight the padding in the back is still in near perfect condition, as comfortable as the day I bought it, all buckles work perfectly still, never once opened on dozens of flights. Only very superficial damage endured so far in its life.

    I’m now getting a Circuit because I’d like something shiny and new and custom for the PCT next year, however, I think my Catalyst would manage it to be honest.

    Thanks Ula!

  24. Peter Lynch (verified owner)

    Just did an acclimation hike with my new Catalyst. I am recovering from a head injury in June that has shortened my backpacking season considerably, and wanted to try a conditioning hike that would also be my first chance to try out my new pack. I followed Chris’s advice and had the pack reasonably full and lighter then it would be for a backpacking trip. With my down jacket loosely arrayed at the bottom of the pack I found it very easy to stabilize my Bear Vault 550 with a sleeping bag liner on one side and an air pad on the other. I felt no slippage during the hike. I had to adjust the shoulder straps and the hip belt a bit, but having made those adjustments it felt very snug and stable. The water bladder pocket works beautifully, I discovered that a strap loop on the left shoulder strap keeps my bladder tube in place nicely, and I was amazed by the amount of stuff that I can get into the hip that old pockets, far more than my old Dueter pack. The shoulder straps stay firmly in place allowing one to do a proper chicken wing move in putting the pack on. Everything has been thought through carefully and some problems solved rather ingeniously on this pack. I find that I can run the strap that closes the pack when rolled down through the lid loop of my water bottles, keeping them securely in place for those trips when I will bring them. At the same time, I can imagine other uses for those capacious side pockets. What a joy to have a pack so easy to use, so backpacker friendly, and so lightweight and well-designed.

  25. Zach

    BY FAR the best pack I’ve ever owned! Most comfortable, best options, incredible craftsmanship, and best customer service are only a few reasons this pack gets my 5 stars. I’m quite a bit bigger guy so I emailed Chris about the fit and after a slew of concerned emails from me, Chris helped me put together the perfect order! He was incredibly helpful! They even got it to me quickly for an upcoming trip! I’ve only put about 30 Miles on it so far but it is insanely well put together and will be the pack that goes with me on the JMT! Thanks ULA!

  26. Lou

    This pack is phenomenal. I bought it when my 20+ year old external frame Jansport died. It is lightweight, durable, customizable (I took out the hydration sleeve and extra shoulder strap lifters). The first trip I took it on was a 7 day Appalachian atrail section hike through the Shenandoah State Park. It exceeded my expectations. I had no soreness on my hips or shoulders the entire trip. It was so comfortable it was like I was naked. I highly recommend this bag. I doubt I will have to buy another bag, but if I do I will purchase from ULA.

  27. Greg S Wheat

    I have the CDT which is my day pack and the Catalyst which is my pack of choice for multi day backpacking. Lots of room and easy to load. Many great features and I added a shoulder strap pocket to both packs to place what ever gear I need for that trip like my cell phone for easy access to take pictures. I have a pack from another company that is suppose to be a 90L pack but is feels like I can not get as much gear in it as I can my Catalyst. My only problem is that I can not reach the water bottles in the side pockets as easily as the guy in the video…must be old age and I am not as limber as I use to be. Still a great pack and I highly recommend it.

  28. Wilderness Trecker (verified owner)

    My wife and I where fortunate enough to have had the opportunity to visit the shop and staff at ULA!!! What a great experience, Chris took us back and watch the magic taking place with the great staff! The feeling of pride in the ladies stitching as well as the guys while cutting the fabrics and inspecting the products was heavy in the air! Looking over some of the different models of packs the quality in craftsmanship and attention to detail was extremely difficult to miss! 🙂 We brought with us our packs we had been using with a full load out as if headed out on the trail. In my excitement I had a pack explosion and a Catalyst loaded up before Chris had brought a hip belt! We got the hip belt positioned and my wife had her pack loaded while I admired this work of art! The design shape every little stitch was immaculate! After taking a few minutes making sure he had our packs fitted properly as well as making sure we knew how to tighten and adjust straps.
    They sent us out the back door with packs on our backs loaded up. It wasn’t long before we noticed a huge difference in the comfort, mobility and just over all feel of these packs. As a couple we both have had many different packs over the years. The most recent being the Rei Flash 62. The change in our backpacking style has gone from shorter weekend to week long trips. Where as now we are doing week or multiple week long distance hikes, ten miles a day or more each day. Where before it was four to five miles in hang out for a day or two then hike another three to five miles then repeat the process getting out. I can’t help to not mention my wife’s comment, ” why didn’t we have these packs years ago! ” We didn’t know about ULA before six months ago.
    After our test run Chris was showing us the 210 Robic material. I was familiar with dynima but this 210 Robic is really robust and actually a bit more heavy duty then dynima or cuben fiber. Chris cut a piece of material with scissors and handing it to me told me to try to tear it. I honestly gave in all my might to try to get this stuff to tear and I could not budge it in the least bit! Not only is this 210 Robic strong but extremely light! I have to say better than cuben fiber due to the extra rip stop reinforcement in this material. These packs are going to be tough unlike other ultralight packs I have seen on the market. The other thing I noticed when comparing ultra light packs is ULA is the only company to offer larger volume packs. I highly recommend a ULA Catalyst or Circuit for those looking at going lighter. It will give you that extra space while you get your weight and gear dialed down.
    If you are like us a year or two ago and you are looking to go lighter just get a ULA you cannot and will not go wrong this pack will last you thousands of miles whether through hiking or if your old school like us just trying to update gear and shed some weight. We used to lug around 50-60 lbs. Of gear food and water and now have our pack weight down to about 30lbs. Including fuel, food and two liters of water.
    The difference is in a ULA when we got home I went on a hike around the neighborhood and I kept telling myself what happened to that ten pounds? What am I missing what did I forget I have to be missing something? I wasn’t missing anything I had all of my gear it was all in just the way this pack carries and feels. Just a mental note just cause you still have space in your pack does not mean you have to add anything!

  29. Barry Wohl

    My favorite pack of the last 60 years.

    I’ve been backpacking since 1957, and I’ve owned: Kelty A4 external frame, Gregory Wind River, Monolite, Ospray, Kelty Cloud 65, AND MANY MORE. For 15 to 35 lb, my Catalyst feels the best on my back. I’ve used it on about 20 trips from 2 to 8 nights over the last four hiking seasons. I’m no longer looking for anything better. Along the way, my other equipment has gotten lighter and smaller, so I have extra space in my Catalyst. AND I got to upgrade my waist belt to one size smaller as I shrunk too. Happy days

  30. Todd from Longmont CO

    JMT Thru-Hike

    I was fortunate enough to snag one of these packs when it was offered in Cuben Fiber. What an awesome pack! It easily and comfortably handled my JMT thru-hike last summer, including carrying my Bearikade Weekender. Very comfortable, and tough. Highly recommend.

  31. Mark Weidinger

    Excellent Pack!

    Excellent, high value pack at a good price. Coming from running 55+ lb loads in my faithful Dana Alpine, I was concerned about the suspension system and load comfort, but it worked fantastically on 7 day Sierra trip starting with 42 total lbs. and dropping as food and fuel (and bourbon) was depleted. Seems like this packs sweet spot is about 25-30lbs.

    Everything about this pack has been so well thought out, from how it packs and rides, the storage options, and accessing your gear. Its also a sweet looking pack with more volume than I will likely ever need. I got the large with large belt and regular straps, run a Zpacks Cuben dry bag as a liner (2oz), dropped the hand straps and bladder pocket. Fyi I’m 56yrs, 6ft, 215lbs with longer torso.

    After 40 years of backpacking I’m finally lightening up, and can’t endorse this pack and ULA gear enough. Thanks ULA!

  32. Axel W

    Versatile and Comfortable Pack

    I have used the pack for a number of different trips, but recently took the pack on a 7 mile hike with 2300 vertical feet with a full 40 lbs of gear (well, probably 45 lbs) with a 500 ft climb over 200 yards in the middle and a corresponding climb back down the next day. The Catalyst worked great even with a full load +! The hip belt kept the weight off of my shoulders, which allowed me to climb over and under logs, grab roots on the way up, and keep my balance on the way down. Thanks ULA for making a great pack that works with 40 pounds or 20 pounds of gear! PNW fan!

  33. David Marshall

    First trip, pack worked great

    I finally took the break in trip with my new Catalyst. The trip was not long, but gained 2400 ft in 4 miles with the end result being beautiful Maxwell lake in the Eagle Cap Wilderness.
    The pack performed very well with a trail weight of 28 pounds. In the past, I’ve had to tinker with my packs to dial them in over multiple trips. After following the YouTube set up and fitting videos, the pack fit and worked like a charm.
    While I’ll keep chipping away my pack’s trail weight, the Catalyst is flexible enough to go both lighter and a bit heavier for early summer Cascade volcano climbs.

    The Catalyst is a great combination of light weight and versatility.

  34. Anonymous

    Still backpacking at 60 years old

    I was hesitant to buy this pack for two reasons. One I couldn’t try it and second it didn’t have all the pockets of other packs. After 7 days out- I can say I love this pack. The customer service was excellent. But most importantly it carried weight fantastically. The lack of pockets did not bother me. When I was in my 20’s and 30’s I could hike 12-14 miles with a 55 pound pack. In my 40’s and 50’s it became a 40-45 pound pack. Now at 60. I am comfortable hiking 14 miles a day with a 33 pound back . Looking forward to going lighter but for now- The Catalyst carries my load. I choose the catalyst over other styles because I do hike internationally and need to put my pack on a plane.

  35. Brian

    Great Overall Pack

    I have had the opportunity to use this pack a handful of times in the past few months since I purchased it. I love it. I did my homework on several packs and settled on this one. The primary reason I purchased was for thru-hiking and other types of backpacking in outdoor areas. I was also looking for a pack that would translate well to other types of urban backpacking and international travel and it has done all I have wanted and more. It is very comfortable, versatile and has a great balance of lightweight and durability that I wanted. I know I will have this pack for a long time I highly recommend the catalyst.

  36. Stephen Stone

    Catalyst trial

    My old pack finally gave out and I needed a new one for a 6 day trip to Yosemite in September. The pack came on Friday and on Saturday I took it on a two day 20 mile trip. I carried my gear plus my 8 year old daughters gear. It put the load on my hips better than my old one, weighs half as much and withstood some bushwacking without any tears. I am very pleased with the pack.

  37. Peter

    Great pack, great service!

    As a owner of the excellent circuit pack, the catalyst is essentially the big brother of the two and is great if your going on longer outings or winter hiking. In addition to the pack, I also ordered the new shoulder strap pockets which I highly recommend! Just write which color you prefer in the comments and they can match your ULA pack color. The pocket is perfect for a smart phone and other items you need to gain quick access to. Also I’d like to note the excellent customer service I received. I originally received a smaller hydration sleeve with my pack that didn’t fit my hydration bladder. After contacting ULA they sent me a bigger, wider hydration sleeve free of charge!

  38. laure manheimer

    light, capacious, comfortable and easy to pack

    I am 120 lbs and 5 feet 5 going for a week backpacking trip at 10-12,000 feet in the Sierra Nevada. to replace my old backpack, . i chose a Calayst, size small, S curve. . And it is all it promised to deliver and more. It is light,simple to pack. the main compartment is wide enough to accommodate a sleeping bag without spending 10 mns compressing it into a tiny roll (as in the Osprey). it is wide enough to easily insert a bear canister horizontally + all my clothing

    gear to stay dry and warm + everything else i would need during the day all fit on outside pockets easily reachable without opening the main compartment. Two capacious hipbelt pockets keep all the immediate stuff within easy reach without removing backpack. On an outside loop i put my tent and my sleeping pad. it was all so easy to pack. And it is COMFORTABLE.

    Everything – excluding water in my camel back and the canister full of food- weighed 19 lbs! it was just perfect. and the staff is VERY helpful.

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