Osprey Youth Jet 18 Backpack Nylon Imported The external reservoir sleeve provides an easy way to access a reservoir whether the pack is full or empty The fixed top lid has a zippered compartment for storage of extra items Underlid zippered compartment keeps items safe and secure Mesh side pockets help keep items like water bottles readily accessible Small external pocket keeps gear organized and items like snacks and sunscreen accessible Two interior zipper pockets and three exterior.