Constructed of 300D Polyester and water-resistant material,One security hook zipper head with water resistant zippers,Built-in USB 2.0 charging port,Main compartment opens at the back and features a large RFID pocket, simple organizer and two mesh pockets,Padded inside slash pockets hold a 15” laptop and a Neoprene tablet pocket,Hidden back zippered pocket for extra security,Luggage strap – padded for added backpack comfort and easily slips over luggage handle,Features include 2 side mesh pockets, padded adjustable shoulder straps with integrated handle, padded back and top loop