Suitable for day hikes, travelling & exciting adventures in the mountains, the Camelbak Arete 22 hydration running backpack offers a hydration capacity of 2 litres (70oz) & lets you organize your gear & conveniently carry a trail map, clothing, snacks & a headlamp. This highly compressible transformer easily reverses into an insulated reservoir sleeve to keep your water supply secure in a larger pack & has a practical zipper lid pocket with a key clip, as well as a side stash pocket for all the necessities. There are adjustable backpack straps, an adjustable sternum strap & a removable waist belt for the most comfortable & firm fit & the rucksack comes with Antidote® reservoir with patented Big Bite Valve for hands-free hydration & Hydro Guard technology ensuring protection against fungus & bacteria.