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Made of taste-free polyurethane so you can enjoy the thirst-quenching taste of water, the High Sierra 1.5L Packaged Reservoir features a hands-free bite valve that allows you to simply bite-down and suck to draw the liquid through the tube. The water tube is insulated to help prevent the water from freezing in cold weather. The 1.5L reservoir has double-welded seams to prevent leaks, and its large fill-hole accepts user-supplied water filters for when you have to refill from less-than-ideal sources.