Dimensions: 18.8 x 5.1 x 13.7 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. Four outside pockets, convenient to oganize your items you want to carry. 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.