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Whether you’re trekking the Himalayas, sport climbing or fell walking, you need a backpack that moves with you across the terrain.

The guide covers everything you need to know about finding your back length to help you choose the right size pack for your trip.

What This Guide Covers 

Back Length Explained


How to Measure Back Length

Find your torso length to choose the right size backpack for you

Lowe Alpine Backpack Sizes

Sizing tables for packs with fixed and adjustable back length

Back Length Explained

Many of our packs, and specifically the bigger and more technical packs are available in different back lengths or adjustable back lengths. Contrary to popular belief, your torso length and not your height is the key to getting a well fitted pack. Tall people don’t necessarily have long back lengths, just as shorter people may have a long back length.

What is back length?

Your back length can be found by measuring from your C7 vertebra (the bony protrusion at the back of your neck) to your iliac crest (the top of your hips).

Finding your back length measurements will help you to select the right size pack for your body for the most comfortable carry, wherever your adventures take you.


What is back length?

You will need a tape measure and a friend to help you out.

  1. Place your hands on your hips and tilt your head forwards.
  2. Ask your helper to measure from the bony protrusion at the back of your neck to where your hands sit on your hips.
  3. This measurement will give you an idea of which back length to choose. 


Lowe Alpine Backpack Size Guide

As a guide our packs fit as follows:

Fixed Back Length

Women's Regular Back Length   Regular Back Length  Longer Back Length 
16"/ 41cm  18"/ 46cm  20" / 51cm 

Adjustable Back Length

Lowe Alpine packs flex to fit to your body shape, so don’t worry if your back length does not measure exactly 16, 18 or 20 inches. We have adjustable back lengths on many styles of packs in our ranges.

Carry System  Women's Regular Back Length   Regular Back Length  Longer Back Length 
VT Flex / VT Plus  17-21” / 43-53cm 19-23” / 48-58cm 21-25” / 53-63cm
V-Trax  14-18” / 36-46cm 16-20” / 41-51cm 18-22” / 46-56cm
Air Contour+  17-19” / 43-48cm 19-21” / 48-53cm 21-23” / 53-58cm
Air Contour  14-18” / 36-46cm 16-20” / 41-51cm  18-22” / 46-56cm
AirZone+  17-19" / 43-48cm 19-21" / 48-53cm