1.Premium Design Excellence comes from sleek balanced design with a wide mouth big zip opening, BPA & PVC Free Thermoplastic technology. That's what makes up our superior taste-free 2L Hydration Reservoir. Our quality paired with an unbeatable customer experience makes us the ONLY choice for premium water bags 2. CREATED FOR THE ACTIVE : From our drip free/leak-proof design to our slim profile with center baffle, every part of our water bladder is made with you in mind We made our water bags reversible so that you could easily clean by hand or on the top shelf of the dishwasher. Our quick connect tube and 360 degree fast flow mouth valve is great for all outdoor activities. 3.LARGE OPENING:Different from others,our hydration bladder has one of the largest opening.The big opening is easy for pouring water and it is wide enough for a hand or bottle brush easily access to the interior hydration bladder.You can even scoop ice cubes directly from the fridge into the water bladder,and best of all it has insulation that allows the water to resist quick temperature change. 4.HIGH QUALITY:The hydration bladder is made of EVA material.Taste free, BPA free and food grade.It wont leave a bad taste in your drink.The hydration bladder is also passed the pressure test,it is leak proof.Double sealing side technique has greatly improved durability. 5.LEAK PROOF:Soft yet durable mouthpiece with easily accessible ON/OFF valve prevents leakage.You can control the water flow by biting, when not bite, the water will not leak out. Quick-release tube is detachable.