100% polyester. Of which 50% recycled polyester. 600D polyester anti-theft backpack. Reinforced cut-proof front panel. Back zip closure with TSA combination lock. Back-protected quick-access zipped pocket. Adjustable shoulder straps and sternum strap. 2 zipped pockets on the shoulder straps. 2 straps on bottom to hold jackets or sweaters. 2 side pockets. 1 side pocket with built-in USB port connected to inner power bank holder (inner micro USB cable provided). 1 side pocket with theft-preventing coiled cable to attach the backpack to table/chair leg. Inner compartment with padded laptop sleeve for laptops up to 15 inches. Padded tablet sleeve for tablets up to 11 inches. 2 mesh zipped pockets. 2 detachable zipped pouches for cables or accessories. 2 inner pockets, including 1 for bottles or flasks and 1 for storing a power bank. Integrated Rain Cover.