Perfect for hiking & traveling, the Camelbak Arete 18 hydration backpack will help you stay organized & properly hydrated & has a 1.5 litre (50.7oz) Crux reservoir offering 20% more water per sip. Thanks to a reversible design, the backpack easily converts into an insulated reservoir sleeve & features one main compartment & two side pockets for your snacks, extra layers & all the essentials. A comfortable fit is ensured by adjustable backpack straps, a removable sternum strap & a lightweight back panel, whilst a reservoir with an ergonomic handle & an on/off lever guarantees easier refilling & prevents leaks.