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Size Guide

Your torso length can be found by measuring from your C7 vertebra (the bony protrusion from the back of your neck when looking down) to the height of your iliac crest (top of your hip bones, where you put your hands on your hips).

This measurement will give you an idea of which pack back length to choose.

Lowe Alpine's AdaptiveFit harness means that the packs flex to fit to your body shape, so don't worry if your back length does not measure exactly 16,18 or 20inches. Adjustable back systems on larger packs and alternative back lengths on many styles of packs in Lowe Alpine's ranges enable almost anybody to find a pack that will fit correctly.

As a guide Lowe Alpine packs fit as follows:

Fixed Back Systems

ND (Small / Women'sRegular (M / L)Large (M / L)
16" / 41 cm18" / 46 cm20" / 51 cm

Adjustable Back Systems

Carry System Small-Medium
Medium-Large Large-Extra Large 
VT Flex / VT Plus   
17-21” / 43-53cm   
19-23” / 48-58cm 
21-25” / 53-63cm
V-Trax 14-18” / 36-46cm16-20” / 41-51cm18-22” / 46-56cm
Air Contour Plus17-19” / 43-48cm19-21” / 48-53cm21-23” / 53-58cm
Air Contour 14-18” / 36-46cm16-20” / 41-51cm 18-22” / 46-56cm
AirZone Centro 16-18” / 41-46cm18-20” / 46-51cm 
Kulu Airmesh 16-18” / 41-46cm18-20” / 46-51cm20-22” / 51-56cm