The Hajker Hydration Backpack is made for highspeed activities and delivers the ultimate in stability with the bounce-free NDA™ 2.1 harness system. This unique harness system uses integrated elastic straps that expand along with the chest during physical exertion, allowing a constant tight and flexible fit. Meanwhile, the shoulder straps are fully adjustable and ergonomically designed to ensure a smooth distribution of the packs weight across the shoulders. The back panel is also adjustable and can easily be adapted up and down. The back panel also optimises ventilation to keep you cool and dry during your most intense adventures. The pack features a huge range of storage options that help you carry all your kit and keep it organised. The backpack features a detachable stash carry which fits most helmets, plus a detachable waist belt that can be used in conjunction with the pack, to provide a secure lower fit, or as a separate hip pack. Additionally, the rucksack features two stash side pockets, various interior large pockets and sections, a waterproof passport/ID zippered pocket and more useful storage features.