Main compartment: 18.5? high x 11? wide x 4? thick with internal organization * Top front: 9? wide x 4.5? high x 2? thick with internal organization * Bottom front: 10? high x 9? wide x 2? thick with internal organization * Approximate Capacity: 1100 cu. in. * Fits up to 15.4" (diagonal screen size) laptop computer.