Serve major sexy vibes with the Silly In Space UV Reactive Hydration Pack with Back Pocket for Anti-Theft! It features a large capacity water storage to last u all night and a colorful, quirky print that'll let ur fun, cosmic personality shine. Features an anti-theft back pocket! Adjustable comfortable straps & water resistant fabric 2 liters bladder (415*170*23mm EVA material) Has 5 pockets: an insulated hydration compartment located on the back, main pocket, 2 side pockets, and a safety back pocket Adjustable chest belt & buckle with whistle Dimensions: 18 x 11 x 1.25 with 13.5 oz