Amandir Hydration Bladder 2 Liter Leakproof Water Reservoir BPA Free Hydration Pack Replacement for Biking Hiking Climbing Cycling Running, Large Opening EASY CLEANING & FILLING - Our hydration bag bladder with large opening design. It makes for easy filling of water. It is also enough wide for a hand or bottle brush easily access to the interior water bladder in order to wash it. For cold water, just add ice cubes directly. LEAKPROOF DESIGN - The hydration water pack with ON/OFF valve, remove the quick-release tube after shut off the valve, bladder will stay filled water non-leaking. Using our high flow bite-valve, just bite the soft mouthpiece to suck water. Our military hydration bladder conrol the water flow through the bite. When not use, just cover the dust cap. GREAT MATERIALS - Our hydration reservoir bladder is taste free, non-toxic, BPA free and FDA certified, strong hydrolysis resistance, high strength and high water pressure resistance. And smoothness of the liner prevents germ and dust from adhension, promotes your health. HYDRATED - The hydration pack bladder (2L) can bear temperatures from -20 to 50 degrees celsius. Insulated tube design can resist temperature changes in hot and cold weathers. It is compatible with most hydration packs, and suitable for many occasions, such as daypack, bike, camping, hunting or rain survival and so on. Everywhere you will need it! RISK FREE - If you are not satisfied with your water bladder bag, contact us any time, we will get you back within 24 hours and try our best to make things right.