Camelbak big bite valve blue description the patented big bite valve mouthpiece offers hands free hydration and is ideal for any high performance situations easy to use just bite and sip self seals after each drink to eliminate annoying drips features one piece silicone design includes no moving parts to break big bite valve self seals after each drink to eliminate annoying drips camelbak got your bak guarantee if we built it well bak it with our lifetime guarantee specific