Gregory Gregory Bite Valve Cover Backpack | Travel Backpack from Gregory Mountain Products | Bite valve cover with integrated tether to keep your next adventure dirt and dust free (at least in your reservoir). Compatible with all of Gregory's Dry lock Magnetic Bite Valve’s and reservoirs. Simply thread the tether over the hose to secure and you’re ready to hit the trail.Bite valve cover with integrated tetherCompatible with Gregory's DryLock Magnetic Bite ValveThread tether over hose before bite valve to secure coverFits up to a 0.5" / 13mm outer diameter hose• Weight: 0.14 ozs.Body Dimensions: 1.1" x 1.1" x 1.0"Overall Dimensions: 1.1" x 1.1" x 1.0"