Come and Check Our Promo Solutions.Our hydration bladder has one of the largest opening on the market. 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 4" 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.The whole hydration bladder is made of premium material. CHERAINTI water reservoir is taste free,, SGS certified and 100% food grade. This tested to comply with international safety standards. It won't 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. Pls check inventory and detailed info with us before placing your orders.