The CamelBak Mule Hydration Pack is signature hydration system for mountain bikers. The Mule offers superior secure overflow storage and incredible stability coupled with a 100 oz reservoir, hikers, campers, kayakers and riders can comfortably hydrate for 3+ hours on the trail or on the water. Plus, the CamelBak Mule features an excellent combination of organized and overflow cargo options and features the new Antidote reservoir which has a quick-snap cap that tightens in a quarter turn and a quick-disconnect tube system.