Lining Material: 100% Polyester. Filling Material: 100% Polyethylene. Material: Polyester PU Coating, PVC. Capacity: 30L. Pockets: 1 Front Pocket, 2 Mesh Pockets. Compartments: 1 Main Compartment, Whistle Holder. Features include an Airflow Back System, Carry Handle, Hydration Pack Access, Padded Back, Padded Straps, Pole Loops, and a Sternum strap. Design features Contrast and a Logo. Fastening: Zip. This backpack is suitable for adults and is unisex.