100% Polyester. Fabric: Ripstop. Height: 43cm. Length: 30cm. Width: 13cm. Fabric Technology: Breathable. Fastening: Zip. Air Mesh Back, Bungee Straps, Compression Straps, Hydration Bladder Compatible, Padded Back, Padded Straps, Shoulder Strap. Compartments: 1 Main Compartment, Bottle Holder. Pockets: Multi Pocket. Capacity: 18L. Please Note: Hydration Bladder Not Included. Heavy Duty. Ref: UTMW1554