The Startle Backpack is a 100% polyester backpack with one large main compartment, a laptop sleeve (fits most 15-inch laptops), and an internal organizer. It also features external zip pockets, stretch mesh water bottle pockets, and ergonomic padded shoulder straps. Measuring 17 L x 11.75 W x 5.5 D inches, the Startle Backpack has a 21-liter capacity.