Description of Camelbak H.O.S.S. 100oz Camelbak's most technical cycling system, the H.O.S.S. features the new D.V.I.S. back panel technology - a dynamic, self-adjusting, ventilated panel that moves the pack away from your back. Features a roll-top waterproof main compartment to keep your gear dry in the worst weather conditions. Comfortably holds 100oz / 3L reservoir, and raises the bar for hydration in mountain biking. Features: OMEGA HydroTanium reservoir with a lifetime warranty CamelBak D.V.I.S. back panel offers ultimate ventilation with a dynamic, self-adjusting fit Dynamic suspension harness and removable waist belt maximize load stability Waterproof roll-top main compartment Durable splash guard protects pack from mud and abrasion Easy-to-access MP3 pocket with weather-resistant zipper Secure storage for pump, tube, tools and energy bar