The Osprey Raptor 14 Hydration Pack is a fully-featured mountain biking pack designed for comfort and convenience on the ride. The tensioned AirScape backpanel provides excellent ventilation to keep you cool and the wing-shaped shoulder straps are tailored to optimize comfort in riding position. The hipbelt has zippered pockets for keeping quick-grab items handy and a removable tool roll keeps your bike tools neatly organized. The included 2.5L Hydraulics® reservoir makes loading up the good stuff quick and easy. And by good stuff, I mean that high-quality H 2 0.