SAFETY PROMISE - 100% BPA and PVC free, the hydration bladder meets all relevant safety standards. The tasteless and environmentally friendly PEVA material can be recycled easily. Compatible with most hydration backpacks (NOTE: This product does not include the dust cover inside the video) EASY DRINK - Light suction gives good hydration . Drink water directly from the valve without clogging your steps or taking off your backpack. Convenient hydration reservoir for your outdoor marathon, run, hike, bike, climb PRACTICAL WATER BAG - Both top opening and bottom connection are waterproof. Wide mouth opening with reinforced zipper that is waterproof and easy to fill, clean and dry inside the hydration water bladder SPACE SAVING DESIGN - Design of the water bladder compact and built for long life for durable use. The water tank stands upright when full and shrinks in min volume while empty, perfect for conserving space. Feel free to drink it or fill it up. The more you drink, the smaller it gets EASY CARRY - The ultra-lightweight hydration system is portable enough to take you anywhere. It can be put compactly in your hydration vest. Great replacement tank for kids and adults