3G AK37 (RT)
£229 / €275 / $299

The AK37 ushered in the third generation of crux’s AK backpacks, being the first to come off the production line in the relaunch of our iconic range. What’s new is a lighter body fabric with a 40% Kevlar® / 60% Cordura® composition (compared with 28% Kevlar on the previous generation) and a fully welded construction. A top-loading style, it now features a roll-top closing system under the hood for complete waterproofness. The classic, minimalist design and clean lines remain unchanged.

The baby of the range, the AK37 is frequently used by owners of one of the larger AK models as a companion for all their non-mountaineering activities, such as cragging, multi-pitch rock, back-country skiing, canyon hiking, or any other abusive activities that normal daypacks won’t handle.

The AK37 is now available in two back-lengths; regular and long.

Whilst these are available through our retailers, demand is outstripping our ability to make them, and stock is very limited. Only Blue in regular backlength, and gunmetal in long backlength, are in stock.




External lid pocket with welded seams for water-resistance
Roll-top closure system for a completely waterproof main compartment
Oversized back haul loop – easy to grab and clip
Top compression strap
Side compression straps – quick and easy to fit or remove
40 mm webbing waistbelt with low-profile full-sized hip-fins
Two ice-axe holders
Stretch wand pockets
Welded construction throughout

Technical Specifications

Capacity 37 litres
Weight 1040 g
Fabric 40% Kevlar / 60 % Cordura, 240 g/m²
Frame 2 x 7.00 mm Ø tubular titanium stays (removable)

Regular (all colours)
Long (all colours except blue)

Spares & Repairs

If you break any buckles or your frame (it does happen), then don't panic. We have replacement parts for nearly everything. Please go to the spare parts section of our online shop.

Crux rucksacks don't often need mending, but they are not completely immune to abuse. Should your sack ever need repair, then please click here for details of our recommended repair companies


These have just started arriving and the only options currently available are:
Blue (Regular)
Gunmetal (Long)

The remaining colours and size options are due in early 2017.