The CamelBak OMEGA Water Beast Reservoir is the ultimate delivery system for an operator's water supply. The reservoir's proven durability, OMEGA wide mouth opening, rugged materials ensures the reliable delivery of water during extreme operational situations. The Bladder features the Big Bite Valve made of medical grade silicone. The Omega also includes HydroGuard Technology, which inhibits the growth of bacteria on reservoir and tube surfaces. Third party testers have proved the taste-free multi-layered Pure Flow drink tube to keep water tasting fresh -- no plastic taste. Includes the CamelBak Got Your Bak Guarantee: If they built it, they will Bak it with a lifetime guarantee.