Durable material: high-quality fabric which is waterproof, anti-scratch and friction resisting, combined with soft and comfortable polyester material. Dimension & capacity: 12 x 5.5 x 16.5 inches. Large capacity 18l with several organizer pockets could meet your various needs. The large compartment with a padded sleeve inside backpack for upmost 15.6 inch laptops/macbooks/computers for students, teens, girls and women. Several organizational pockets can be used for wallets, keys, books, pens and other stationery. Water bottle and umbrella pockets at the side of backpack. Comfort & aesthetics: ergonomic design and adjustable padded reinforced straps could provide extra safety and comfort. Key chain and butterfly knot are specially brilliant design. Multipurpose: the large capacity casual backpack is really great companion. For outdoor/indoor activities and perfect for daily use at anywhere for school, camping, hiking, vacation, travel, weekend getaway, occasional travel, overnight trip.