The Camelbak Arete 22 hydration hiking backpack is a great companion for your minimalist adventures, as well as for peak bagging & travelling & offers Crux reservoir with 2.5 litre (84.5oz) capacity, an ergonomic handle & an on/off lever to prevent leaks. The backpack is not only sleek & ultra-lightweight, but also quickly & easily transforms into a reservoir sleeve to keep the water supply insulated & secure within a larger pack. It features an adjustable sternum strap, a lightweight back panel for a comfortable fit & a removable waist belt for extra stability. Plus, the zippered compartments on the lid & side of the rucksack help to keep your gear safe & protected.