Material: Nylon Opening method: zipperFunction: wear-resistant, lightening, waterproof, anti-theft, shockproof, breathableApplicable product types: ipad, notebook, tabletBag size: largeStyle: backpack / backpackStyle: BusinessBag shapes: square vertical section Outer bag type: three-dimensional bagLining texture: polyesterAccessories type: bucklePopular elements: printingColor: black, redSize: 13 inches, 15 inches, 17 inches