CamelBak H.O.S.S. 100 oz Hydration Pack New CamelBak D.V.I.S. Back Panel offers ultimate ventilation with a dynamic self-adjusting fit Waterproof Roll top main compartment keeps gear dry. Durable Splash guard protects pack from mud and abrasion. Secure storage for pump, tubes, energy bars. Dynamic Suspension harness and removable waist belt to maximize load stability.