Dobby Nylon/Ripstop Polyester/600D Polyester. Dual entry large main compartment. Front zippered compartment. Front media pocket with ear port. Thickly padded sleeve that fits most 17 laptops. Padded back and shoulder straps. Zip away bottle holder. Comprehensive front organiser. Front zippered pocket. Side compression straps. Sternum and adjustable waist strap for extra support. Rain cover in lower zip compartment. 10mm zips.