Leakproof Silicone Nozzle SystemA waterproof tip is used. This tip is equipped with an opening and locking device. In the open position, just pull it gently with your mouth, making drinking easy and safe; when closed, water does not leak out and it is securely closed. Safe Food Grade MaterialsOur hydration bladders are made from high quality, soft antibacterial materials. Thanks to its high resistance to hydrolysis, its solidity and high water pressure, the bladder is odorless and tasteless and meets the European test standard EN71. < p>Multifunctional designThe double hole design on the top of the pocket can be used with a special water bladder backpack or with the water filling handle. The lid is designed with a carrying handle for easy handling and safe use. High quality sealing design with a silicone gasket inside the lid to prevent water leakage. Easy to clean and refillThe opening of the water bladder of 2 liters is large enough to be able to fill or refill it very easily, even without taking it out of the water bag. It's also quite wide, allowing easy access to the interior of the hydration bladder with a hand brush or bottle brush. You can also put some ice cubes in the bladder to keep the water cold. Multiple Usage ScenariosSuitable for a variety of scenarios such as running, skiing, hiking, riding , camping, biking, climbing and cycling. It's a must have for lovers of outdoor adventures and a great gift for all kinds of holidays.