Design PhilosophyWhen designing the DuraJak, a tough, featherweight jacket that provides foul weather protection, we thought, doesn\'t your kit deserve the same level of protection as you! Meet the DuraPak, a packable, lightweight waterproof backpack that uses the same cordura reinforced fabric as the DuraJak that will ensure your kit has as good a time as you. Cordura FabricThe Durajak uses Cordura fabric which offers rugged durability and lightweight strength, making the jacket resistant to abrasions, tears and scuffs.