If youre on the move in the great outdoors, youll need to drink more to keep yourself properly hydrated. The easiest way to do this is with a hydration system. You can supplement your Atrack backpack, for instance, with a professional hydration system consisting of a specially designed, 2-liter hydration bladder, a removable tube, a bite valve with protective cap and a thermal sleeve that keeps your water cool for hours. The drinking tube is inserted through the perfectly watertight sealing ring on your backpack. BPA-free easy to clean tasteless made to last Weight: 280 g | 9.9 oz Height: 29 cm | 11.4 inch Width: 28 cm | 11.0 inch Depth: 8 cm | 3.1 inch Volume: 2 L | 122 cu.inch