Mark Ryden Laptop Backpack Expandable 40L Fits 17.3 Inch Laptop Waterproof Business Backpack with USB Charging Port, Anti Theft Carry on Backpack for Men and Women, Black

Dimensions: 50×15×32 cm (conventional), 50×25×32 cm (extended), suitable for 17.3-inch/15.6-inch/14-inch notebook computers, etc. Flight size approval.
Spacious and flexible storage space: Thanks to the fully expanded zipper, the packaging space can be increased from 30% to 40 liters. 1 laptop compartment x1 with thick padding, 12.3-inch iPad compartment x1, extra large mesh compartment x3, extra-deep front pocket and anti-theft device, which can store clothes for 2-4 days.
YKK zipper: This travel backpack uses YKK zipper, which is the world's first high-quality zipper. In addition, the two adjustable foam-filled shoulder straps of the backpack have been reinforced, so they are more durable and will not feel discomfort when wearing the backpack for a long time.
USB port and portability: This laptop backpack has a USB port on the side, so you can charge your phone while walking or driving. The luggage the back of the backpack can fix the backpack on the suitcase and is easier to carry.
Waterproof material: The backpack is made of hydrophobic material to prevent rainwater from entering. However, since the YKK pull link seam is not waterproof, please do not stay in the rain for a long time.