EXPANSION SPACE : The entire backpack size: 17.7 x 12.6 x 4.7~8.7 inches, capacity: 20L~35L. You can expand the capacity by pulling the zipper ( laptop compartment size: 13.8 x 9.8 x 1.2 inchescan accommodate laptops of 15.6-inch and below).
WATERPROOF& HARD SHELL : Upgraded EVA material for surface.Hard shell and waterproof. Zipper part is also waterproof.Can keep internal items dry.Do not worry about rain. Scratch resistant and not easy deformed.
ANTI-THEFT : The TSA anti-theft lock, the hidden pocket on the back and the hidden card holder on the shoulder strap all help to protect your valuables from thieves. Its luggage strap can be installed on a suitcase , which is very convenient for international air travel and day trips.
USB CHARGING PORT : This USB backpack has an external USB charging port and an internal charging cable, which provides a more convenient way for you to charge your phone while walking. (Note: USB cable is included, but User needs to prepare power bank .)
EXCELLENT MATERIALS : Adjustable chest strap and non-slip, breathable S-shaped mesh shoulder strap makes you feel comfortable and not tired. The 3D honeycomb breathable backrest can reduce the stuffiness of the back. Oxford fiber and polyester material makes it more durable.