Lightweight 21-ounce bottle is designed specifically for cyclists; CamelBak is official hydration sponsor for pro cycling team Garmin-Sharp-Barracuda * Double-wall construction keeps water cold twice as long as standard sport bottles; innovative, self-sealing silicone Jet Valve * 100% BPA-free TruTaste polypropylene with HydroGuard lets you taste your water, not your bottle * Positive lockout for leakproof transport; wide-mouth opening is easy to fill with ice and water; also keeps warm beverages warm * Includes limited lifetime manufacturer"s warranty