The CamelBak Crux(TM) replacement tube has larger diameter and offers more water per sip than previous tubes. Pair with the Crux(TM) reservoir on/off valve (sold separately) for 20% more water flow per sip. This replacement tube is NOT compatible with older style Antidoteor OMEGA; reservoirs. Features and Specs Features Hydroguard technology inhibits the growth of bacteria in the tube 100% free of BPA, BPS and BPF 20% more water per sip Specs BPA/BPS/BPF Free