Thanks to a waterproof roll-top closure and a back panel that promotes airflow like mad, the CamelBak H.O.S.S. Pack keeps your gear and your back dry on epic mountain bike rides. CamelBak built an independent pod suspension system into the back of the H.O.S.S. so weight gets evenly distributed and you get mad air ventilation throughout your full-day adventure. The large front pocket on this CamelBak pack gives you quick access to your bike pump, tube, and tools, while the main compartment holds snacks and an extra jacket. The three-liter water reservoir keeps you hydrated on the trail, and a media pocket makes it easy to bring your MP3 along.