LARGE OPENING FOR EASY CLEANING & FILLING - Our reservoir has one of the largest openings on the market. The large opening makes it easy to fill with water. It's also fairly wide for a hand or bottle brush to easily access the internal hydration bladder. The 4" screw cap is easy to screw on and off. If the water is cold, simply add ice cubes directly from a scoop or ice dispenser to the refrigerator. The smoothness of the liner prevents germs from sticking and PREMIUM QUALITY - The Entire hydration bladder is made of high quality antibacterial material. Tasteless, non-toxic, BPA free, SGS and FDA certified. This has been tested to meet international safety standards. It will not leave a bad taste in your drink. The water bladder has passed the pneumatic pressure test , it is pressure tolerant. Double seal side technology has greatly improved durability. Could be the toughest hydration bladder on the market STAY BETTER HYDRATED - This 2L water container can withstand temperatures from -20 to 50 degrees Celsius. INSULATED TUBE resists temperature changes in hot and cold weather conditions.L 14.2'' x W 6.8'' hydration bladder is compatible with most hydration packs. The tube (0.4" diameter, 40" long) provides a healthy flow for easy drinking, keeps you hydrated while cycling, cycling, hiking or running! 100% LEAKPROOF - You won't get high with our -Flow bite valve braked. Simply bite the mouthpiece to suck water. Soft mouthpiece with easy-access ON/OFF valve prevents leakage. It also has a cover to keep the dirt out. Conveniently control the water flow by biting, if not biting, the water will not leak. Quick release tube is detachable. Automatic shut-off while hose is removed, bladder remains full and leaking Packaging dimensions (L x W x H): 3.4036 x 19.7104 x 42.9006 cm