The camelbak crux reservoir onoff valve pairs with the big bite valve shutting off the water flow for added security during transport ergonomic onoff valve make it easy to grip tube and toggle while you39re on the move turn off water flow from camelbak crux reservoir during transport 45 degree bend perfectly positions the big bitetrade valve for easy drinking the patented big bite valve mouthpiece offers hands free hydration and is ideal for any high performance situations self seals after e