1.LARGE OPENING FOR EASY CLEANING & FILLING : The big opening makes for easy pouring of water. It is also fairly wide for a hand or bottle brush easily access to the interior hydration bladder. The screw on cap goes on and off easily. For cold water, simply add ice cubes directly from a scoop or refrigerator ice dispenser. The smooth inner of water reservoir promotes health and is easy to clean.2.PREMIUM QUALITY : The whole hydration bladder is made of premium EVA material. water bag is taste free,This tested to comply with international safety standards. It wont leave a bad taste in your drink. The water bladder passed pneumatic pressure test, it is pressure-tolerant. Double sealing side technique has greatly improved durability. 3.REMAIN PEFECTLY HYDRATED This 2L water reservoir can The temperature of the water should not exceed 60 degrees, otherwise the bag body will be scalded, and beverages or dairy products are prohibited. The tube resists temperature changes in hot and cold weathers. Provides a wholesome flow for easy drinking, keeping you hydrated when biking, cycling, hiking, or running!4.WELL-SEALING WATER BLADDER : You won't be slowed down with our high flow bite-valve. Simply bite the mouthpiece to suck water. Soft mouthpiece with easily accessible ON/OFF valve. It also has a cover to keep dirt out. Conveniently control the water flow by biting. Quick-release tube is detachable. While the tube is removed, the connnector automatically shut off and the hydration bladder will stay filled. Store neatly in fridge/icebox without tangling hose.5.LEAK PROOF:Soft yet durable mouthpiece with easily accessible ON/OFF valve prevents leakage.You can control the water flow by biting, First pull up on the drinking cap, gently bite the mouthpiece with your front teeth to have a sip and start drinking, push back to stop water flow. Quick-release tube is detachable. Auto shut off while the tube is removed, the hydration bladder will stay filled non-leaking. The water storage reservoir also has a dust cover to keep dirt out.