Carhartt Classic 21L Laptop Backpack. Big enough to carry your day’s essentials, strong enough to take on anything 600-denier polyester with Rain Defender durable water repellent Pack features large main compartment with dedicated 15-inch laptop sleeve. One exterior side pocket Front zippered organization compartment and comfort shoulder straps Dimensions: 12” X 17.5” X 8.75” Volume: 21L