Surface: Waterproofing. Storage size: A4 size compatible. [Large capacity and excellent storage] Size: 30x43x20cm / approx. 1.09kg; Lightweight with a capacity of approx. 26L, this large-capacity backpack can hold a 15.6-inch laptop, a 9.7-inch tablet, 2-3 days' worth of clothes, A4-size documents, water bottles, lunch boxes, and more. It also has a carry-on function, essential for business trips and travel. [Lots of pockets] The backpack is equipped with numerous pockets, allowing you to store items neatly and separately. Main pocket, back zipper pocket, internal zipper pocket, side pockets (not on both sides). Surface material: Nylon/PC laser Lining material: Polyester Color: Black The zipper at the top has some missing teeth and gets stuck in the middle, but there were no problems with use. I am selling this as a decluttering item because I have no opportunity to use it. Thank you very much. Color... Black