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. The hydration bladder is made of premium 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. The water reservoir can withstand temperatures from -20 to 50 degrees.INSULATED TUBE resists temperature changes in hot and cold weathers.Hydration bladder is compatible with most hydration packs.It also comes with drinking tube clips,the clips slide onto your shoulder straps and hold the drinking tube in place the clips prevent the drinking tube from dangling out in front of you. Enjoy sports with it. 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. Auto shut off while the tube is removed, bladder will stay filled non-leaking.The dust cover will protect mouthpiece clean. Product description 2L Leak Proof Water Reservoir Water Storage Bladder Bag BPA Free Hydration Pack Replacement for Hiking Biking Climbing Cycling Running Product Description: This high-quality hydration water pack bladder is ideal for outdoor activities such as cycling, running,hiking, walking and other outdoor sports. This hydration pack has a 2L capacity, andclips quickly and easily into almost all backpack designed to carry water bladders, making it aconvenient addition to your outdoor activities and allowing you to stay hydrated even away from home. Features: BPA-FREE FDA APPROVED Material: Food grade TPU Colour: Green Water Temperature Range: -20 to 50 degree Celsius. Capacity: 2L Tube length: About 39.4 inches / 100cm Bag size: 2L:About 15.35*7.10 inches / 39 x 18cm Package Contents: 1 x Hydration Bladder with Tube