Turn off water flow from CamelBak(R) Reservoir during transport. Features: Shut-off valve lets you control liquid flow. Turn on when you need it; off when you don't. 90-degree bend perfectly positions the Big Bite(TM) Valve for easy drinking. CamelBak(R) Got Your Bak(TM) Guarantee: If we built it, we'll Bak it(TM) with our lifetime guarantee.