The CamelBak Crux(TM) insulated tube offers 20% more water per sip than previous tubes. Its insulated thermal sleeve helps prevent freezing in cold weather and helps keep your water cool in warm weather. Features and Specs Features Designed for reservoirs featuring the Quick Link system for easy click on and off (sold separately) Hydroguard technology inhibits the growth of bacteria in the tube The patented Big Bite Valve mouthpiece offers Hands-Free Hydration and is ideal for any high-performance situations Includes Crux reservoir delivery tube, insulated cover, Big Bite valve, Crux on/off valve and Quick Link connector Specs BPA/BPS/BPF Free