This foam back panel is part of the back panel support system for the Circuit pack. If your back panel is feeling a little thin from years of use, this is the replacement part that will have you back to comfortable in no time flat.
To get the right foam back panel for your Circuit, please select the correct size of your pack from the drop-down above. If you do not remember what sized Circuit you own, check the size tag. The size tag can be found in the seam along the top back of your pack, where the top compression strap meets the back panel. If your size tag is missing, or you do not remember what size pack you ordered, and your pack fits correctly, use a measuring tape and the Torso Size Chart listed in the “Sizing” tab to find your pack size.