Hydration Bladder, 1 Liter Water Bladder Leak Proof Water Cleaning and Storage Mack sure to clean the inside of your Hydration Reservoir before the first use and after each use .1.Fill your Reservoir with clean, warm, soapy water.2.Gently shake Reservoir to cover inside with soap.3.Rinse with clean, warm water.4.Once the reservoir is clean, be sire to air dry it. Mack sure the Reservoir is completely dry before placing in storage.5.Store flat in a cool dry environment.LARGE OPEN FOR EASY FILLING & CLEANING - The 1L hydration bladder opening design is so large that you can fill / refill water easily even you are not taking it out of hydration backpack. Also can put some big ice cubes into water bladder to keep water cool. Large opening help you reach every corner inside, and give your water reservoir bladder throughly cleaning.Makes for a great gift for that outdoors person in your life who runs far, rides far, or traverses mountains in a single day.