PEAK Verve Aerobak 18

It is very important that your torso length and the back length of your sack match approximately, especially when you are using a trekking bag with a bigger capacity- around 40-50lt. and above. Please note that your Torso length is not related to your height. Note: When using a bag of smaller capacity for example, when on a day-trek with a 15-30lt. bag, you don’t have to worry about matching the back-length. How to measure Torso Length

1. Encircle the back of your neck with fingers and bend your head. Feel for the most prominent bump on your spine.
2. Alternatively, standing up straight, bend your head and feel for the most prominent bump on your spine.
3. This is the C7 vertebra and is located slightly above your shoulder line.
4. Now feel for the top of your Hip Bones (Iliac Crest)
5. Draw an imaginary horizontal line from the Iliac Crest towards your spine.
6. Now measure the length from your C7 vertebra to this imaginary point on your back.
7. This is your Torso Length.

Back Length of Sack

Back Length of each PEAK sack is mentioned in the Specification sheet of the respective sack and also given below.   We also have an Adjustable Back System with variable back lengths on many styles of packs in our ranges. As a guide our packs fit as follows: Fixed Back Systems

Product	Sack Back Length
PEAK H42Trail Blazer Mesh	38 cms
PEAK H 48 Sierra Mesh	40.5 cms
PEAK F 65 Alpine Mesh	46 cms
GlobeTrotter 60	42 cms

  Adjustable Back Systems  

Sack	Back Length Range
Trail Blazer Aerobak	37-42 cms
PEAK H48 Sierra
PEAK F50 Expedition	42- 48 cm
PEAK F65 Expedition	40-50 cms
PEAK F75 Expedition	40-53 cms

  Do not worry if the sack is slightly smaller than your torso length. However, a sack with a larger back-length compared to your torso is not advisable.