Hydration backpack LARGE VOLUME: In-built 2-litre hydration bladder, 2 inch diameter extra-wide screw cap for easy re-filling, wide enough to insert standard ice-cubes, Putting ice-cubes in the water bladder will not wet the backpack. It also provides ample room for your outdoor essentials. The front pocket is convenient for storing small items such as mobile phones, keys, cards, etc. The backpack has two pockets and an adjustable elastic cord for additional clothing, sports towel and etc.