High Quality Material The Hydration Bladder Is Made of High Quality Pe + Eva Material, Fitted With A Tpu Drinking Water Hose, Resistant To Wear, Corrosion and No Peculiar Odor. It Is An Ideal Water Refueling Equipment for Keeping Humidity When You Live Outdoors. High Quality Material The Hydration Bladder Is Made of High Quality Pe + Eva Material, Fitted With A Drinking Water Hose Made of Tpu, Resistant To Wear, Corrosion and Without Particular Odor. It Is An Ideal Water Refueling Equipment for Keeping Humidity When You Live Outdoors. 100% Anti-Leak Device The Bite Is Equipped With An Off / On Valve To Control If The Water Comes Out, Just Bite The Nozzle Hose To Suck The Water, Through The Biting for ce To Control The Size of The Water Flow, The Switching Valve and Perfect Design of The Portable Double Seal Pliers To Ensure That The Water Tank Has A Good Sealing Perfor mance. Easy To Use The Mouthpiece Is Equipped With A Dust Cover To Prevent Dust From Entering. Remove The Dust Cover, Open The Switch Valve and Gently Bite The Mouthpiece With Your Teeth To Drink Water. The Portable Size Hydration Water Bladder Has 1, 5 L, 2 L and 3 L, Which Can Be Compatible With Most Backpacks. It Is Ideal Equipment for Running, Walking, Hiking, Mountaineering, Travel and Other Outdoor Activities.