Backpack (30L) Made of Oxford 300 D polyester fabric (diamond pattern). The backpack weighs 535 grams. The main compartment has 2 additional pockets and a compartment for documents and a 15-inch laptop. 2 side pockets, can hold a 1.5 liter water bottle. Central pocket for small books, notebooks, or other things. The fabric is not waterproof, but it can dry quickly after getting wet.