LARGE OPENING DESIGN: The 3.1-inch large opening prefect for filling and cleaning; Hand and brushes are easily accessible to the internal hydration bladder for cleaning, thereby promoting health. After cleaning, it can be stored in the fridge or icebox without tangling hose;
SAFE & HEALTHY: The hydration bladder is made of high-quality material, tasteless, non-toxic, and BPA-free. It will not leave a bad taste for your drink. It has been tested to meet international safety standards and has passed FDA, CE and ROHS certification;
EASY TO USE & LEAK PROOF: Just bite the mouthpiece to absorb water, and easily control the flow of water through the bite. When not biting, the water will not leak. At the same time, it is easy to open/close the valve near the mouthpiece to prevent leakage;
PERFECT FOR SPORTS: 15 inches long and 7.5 inches wide are compatible with most hydration backpack and are suitable for all outdoor adventures like running, hiking, biking and cycling;
100% MONEY-BACK GUARANTEE: After you purchase, we have a 100% refund warranty. If you are not satisfied with the purchase of a hydration bladder for any reason, we will refund you a full refund or offer a brand new replacement for free.