Easy cleaning and refilling: the Wide opening is large enough for your hand to clean the hydration bladder, easy to clean. fill with water and add ice cubes. High quality food: the pocket with Water bottle is made of PEVA material, BPA free, approved for use. SGS and FDA, safe for drinks. First pull out the drink cap, gently bite the mouthpiece with your front teeth to have a sip and start drinking. To drink, push back to stop the flow of water. Convenient and quick to have a drink. Leak-proof design: soft tip with on-valve /easy-access stop to prevent leaks. Easily control the water flow by biting, when you don't bite, the water won't leak. It also has a cover to protect from dirt. The double sealing technique makes the water tank more durable, it could leak under 70kg pressure. Larger capacity : this pocket bag with water is 1.5 liters. It is the best choice for outdoors, enough to drink for a day of hiking, cycling, climbing, running or cycling. 18 x 36 cm, the length of the hose is 99 cm, long enough to drink directly from your mouth. from the bag to; back.