3-in-1 design: laptop protection + USB charging port + shoulder bag. The external USB charging port with built-in detachable cable allows you to easily charge your electronic devices anywhere, anytime. External battery is not included in delivery。Detachable Shoulder Strap + Comfortable Handle: This laptop bag has a detachable and adjustable shoulder strap that can also be stowed in the bag when you don't need it. The soft handle of the bag allows you to carry your laptop comfortably for a long time.Laptop bag like a treasure chest: the side pockets of the bag are ideal for storing smartphones / mouse / chargers / headphones / data cables or other laptop accessories.It's simple, but it can meet all of your needs.Improved thickness, stronger capacity.Universal laptop bag: suitable for most brands of laptops or tablets, SIZEPlease note may not snugly fit all computers, please refer to the description or contact our customer service team for advice.14 InchExternal dimensions: 360 x 265 x 60mm / 14.17 x 10.43 x 2.36 inches, internal dimensions: 350 x 255 x 60 mm / 13.78 x 10.04 x 2.36 inches15.6 InchIExternal dimensions: 400 x 290 x 60 mm / 15.75 x 11.42 x 2.36 inches, internal dimensions: 390 x 280 x 50 mm / 15.35 x 11.02 x 1.97 inches,17 Inch:External dimensions: 435 x 315 x 60 mm / 17.13 x 12.40 x 2.36 inches, internal dimensions: 425 x 305 x 50 mm / 16.73 x 12.01 x 1.97 inches,