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

1- Standing upright, tilt your chin to your chest. Locate the largest lump on the back of your neck. This is your #7 vertebrae. It should be located close to the base of your neck proper.

2- From the #7 vertebrae, measure (with the flexible tape) down the length and natural curvature of your spine to the crest of your hipbones (iliac crest). This measurement in inches is your torso length.

Sizing: Catalyst Packs (torso length)
Small: 15"-17"	Large: 21"-23"
Medium: 18"-20"	X-Large: 23"+
Sizing: Circuit Packs (torso length)
Medium: 18"-20"	Large: 21"-23"
Sizing: Conduit & Relay Packs (torso length)
S/M: 17"-19"	M/L: 20"-22"
Sizing: Amp Pack (torso length)
S/M: 17"-19"	M/L: 20"-22"
Hipbelt Size: Catalyst & Circuit (Conduit/Relay/Amp: one size)
X-Small: 26"-29"	Large: 38"-41"
Small: 30"-33"	X-Large: 42"+
Medium: 34"-37"
Mist Overmitt Sizing: H x W (in) H: length from wrist to finger tip W: length across the palm
Small:7.75"x4.5"	Large:9.75"x6.25"
Medium:8.5"x5.5"
Rain Wrap: Length (in)
Medium: 28"	Large: 32"