Ucon Backpack Black Roll Top School Laptop Commuter Bag Water Resistant NWT A blend of PU and polyester enables water-resistant properties. It boasts a soft outer surface and exceptional hand feel, same for the inside because of its brushed polyester lining. Three pockets outside for e.g. bike lock or umbrella High quality neoprene laptop compartment (up to 15.4") with two additional mesh pockets for phone and wallet Additional elastic band bottle holder and key strap inside Reinforced back with padding and adjustable shoulder straps for more comfort