SPECS: Length: 2.5" Weight: .2 oz. Material made out of Polypropylene/ LDPE (on/off valve) TECHNOLOGY: Big Bite(TM) Valve mouthpiece provides hands-free drinking FEATURES: Turns the water flow on and off Fits the CamelBak(R) Crux(TM) reservoir Self-seals after each sip to prevent drips BPA, BPS, BPF Free Includes 1 valve only