Hydration Pack Backpack, Water Backpack with 2L Bladder, for Hiking, Insulated Suitable Cycling, Running, Rock Climbing and Other Outdoor Activities, blackLarge capacity hydration bag: The 2L hydration bladder can be removed from the backpack for easy cleaning, the rubber mouthpiece has a simple on off valve, just pull it up when you use to drink water, press down to secure the water from spilling make sure it's leak free. Gently biting down the mouth piece to draw water glow into your mouth. Unique design: This hydration backpack smartly designed with ample space for most of your outdoor activities.