The 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. Also includes Big Bite™ Valve and HydroGuard™ Technology. Features the patented Big Bite™ Valve made of medical grade silicone. Supplies unmatched water flow with ease. Wide OMEGA® fillport opening makes it easy to clean and fill. Includes HydroGuard™ Technology, which inhibits the growth of bacteria on reservoir and tube surfaces. Does not protect user from bacteria or other disease-causing organisms. Taste-free multi-layered Pure Flow™ drink tube has been proven by third party testers to keep water tasting fresh -- no plastic taste. 100% Free of BPA and BPS