CamelBak Agent 100oz Hydration Pack. All mountain, all day long is what the CamelBak Agent 100oz hydration pack is all about. With room for everything from your full face Bicycle Helmet to your armor, from your goggles to your phone, plus all the tools, clothing, and nutrition to keep you in action, the Agent is ready for extended stints in the woods. Its 100oz hydration reservoir keeps your hydration needs covered for 3 hours on the trail, plus there's 671 cubic inches of gear space with organizational and overflow cargo options. A pair of fleece lined pockets ensure eyewear and electronics are kept safe while the N.V.I.S. back panel delivers exemplary cross ventilation in a comfortable, lightweight design.