Size: 16.5 x 5.1 x 12.8 inches; Fits up to 15.6 inches laptop. Size: 17.3 x 5.1 x 13.8 inches; Fits up to 17.3 inches laptop. Three carrying styles. You could use it as backpack shoulder bag and messenger bag. Also the straps can be hidden when you use it a messenger bag and shoulder bag. With the exclusive Oxford cloth the laptop bag provides waterproof function and can be more durable and high-end luxuries. Roomy laptop compartment and accessory compartment.Special design laptop compartment with Telescopic belt provides more protection for your laptop. Still keep 3 days clothes for traveling. Roomy enough for your need. Lightweight design is easy for carrying. The top grab handle offers quick grab-and-go style. Ergonomic design ensures the dispersion of gravity of the fulled bag.