CamelBak Vantage 30, 100 oz Hydration New CamelBak D.V.I.S. Back Panel offers ultimate ventilation with a dynamic self-adjusting fit. Med. Fits 18-20" torso/ Large fits 20-22" torso Dynamic Suspension harness, aluminum center stay and vented load-bearing waist belt for stability. Waterproof roll top main compartment keeps gear dry. Stash pocket on the waist belt for quick access to snacks and essentials on the move. Omega HydroTanium reservoir with Lifetime Warranty