The enchanting Lost in Wonderland UV Reactive Hydration Pack glows under UV light, creating a magical atmosphere wherever u go! With a large capacity water storage and an anti-theft back pocket, u can wander freely and immerse yourself in the wonders of ur journey without worry. 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