Deliver water to your parched mouth without delay when you're four hours into an all-day hike with the Hydrapak Blaster Bite Valve. As soon as you twist its silicone body, this valve will release water with the speed of a dam -- no fiddling, fumbling, or excessive biting required. When you're all done, throw on the attached dust cover to protect the valve (and your mouth) from dirt and grimy trail matter.