1. LARGE OPENING FOR EASY CLEANING & FILLING: The large opening makes it easy to pour water. It's also quite wide for a hand or bottle brush to easily access the inner bladder. The screw on the cap goes on and off easily. For cold water, simply add ice cubes directly from a bucket or refrigerator dispenser. The smooth interior of the water reservoir promotes health and is easy to clean. 2. PREMIUM QUALITY: The entire hydration bladder is made of premium EVA material. the water bag is tasteless, this tested to comply with international safety standards. It leaves no bad taste in your drink. The water bladder passed the pneumatic pressure test, it is pressure tolerant. Double side technology has greatly improved durability. 3.KEEP PERFECTLY HYDRATED – This 2L water container. The temperature of the water should not exceed 60 degrees, otherwise the body of the bag will be scalded, and drinks or dairy products are prohibited. The tube resists temperature changes in hot and cold weather. Provides a healthy flow for easy drinking, and keeps you hydrated while cycling, biking, hiking or running! 4. WATERPROOF BLADDER: You won't be slowed down with our high flow bite valve. Just bite the nozzle to suck water. Soft nozzle with easily accessible ON/OFF valve. It also has a cover to keep dirt away. Control the water flow comfortably by biting. The quick tube is removable. While the tube is removed, the connection closes automatically and the fluid bladder remains filled. Store neatly in a fridge/freezer box without tangling the hose. 5. LEAK WAY: Soft yet durable nozzle with easy access ON/OFF valve prevents leakage. You can control the water flow by biting. First pull up the cap, gently bite the mouthpiece with your front teeth to take a sip and start drinking, push back to stop the water flow. The quick tube is removable. Automatic shutdown while the hose is removed, the fluid bladder remains filled without leakage. The water reservoir also has a cover to keep dirt out.