The CamelBak HydroBak is a fundamental hydration system for cyclists. The HydroBak offers a simple, attractive design, convenient features, and the equivalent hydration capacity of 2 large water bottles. With direct access to the 50 oz. Anitdote reservoir, the HydroBak is easy to use and clean. The new Anitdote reservoir features a quick-snap cap that tightens in a quarter turn and a quick-disconnect tube system. The HydroBak carries 50 oz (1.5 L) of hydration in a compact design. This minimalist option is great for shorter torsos or road cyclists that want to keep jersey pockets accessible.