Brand:CoolBELL. Description:Multi-functional Bag Size: 17.7 x 5.1 x 18 inches. Fits up to 17.3 inches laptop. Weight:1 kg Color: Black Material: Oxford cloth Nylon, Fabric. 210D Waterproof Polyester Lining Three carrying styles:Backpack style: Comfortable back strap system, easy and convenient to load on your back.Shoulder bag style:One back pocket for hiding the back straps, A removable Shoulder strap been include, when you use it as a shoulder bag.Messenger bag style:One back pocket for hiding the back straps when you use it as a messenger bag. Fits up to 17.3 inch laptop. Huge and reasonable space. One laptop compartment keep a 17.3 inch laptop,two layer of shockproof padding keep the laptop safe. The document compartment with several pockets inside, store accessories reasonably. Multi-function convertible bags can help you convert different style of carrying in different occasion. With the exclusive Oxford cloth the laptop bag provides waterproof function and can be more durable and high-end luxuries. Built-in anti-shock waterproof foam can always prevent impact force to protect your important item like laptop.