[Waterproof Material] :This stylish gaming laptop backpack is made of high-density waterproof PC/ABS hard shell and oxford to ensure your items stay dry during light rain. Soft polyester lining will protect your laptops from shock and scratch; Dimensions: 18.5”x13”x3.5”, fits up to 17.3” gaming laptop. [Tsa Custom Lock] : The lightweight travel backpack can be freely opened 90-180 degrees, allowing you to quickly pass the airport security check and keep your things tidy. TSA customs lock can protect your items from thieves.(Please don't set a password before reading the instructions) [ USB charging port ] : with external USB port and build-in cable connected with your power bank inside which will charge your phone more easily. (Power bank not included) [ ERGONOMIC DESIGN ] : Adjustable anti-slip breathable S-shaped mesh shoulder straps with plentiful sponge help relieve the stress from your shoulder. 3D honeycomb breathable back cushion can reduce the sultry feeling of the back. [Time-saving and Convenient] : The invisible card pocket next to the shoulder strap, easily taking out the transportation card to pass underground subway gate or pay on bus. The back has a strap which can hold the backpack upright on the luggage's pull rod for easy traveling.