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