Amazon.com: MATEIN Carry on Backpack, Extra Large Travel 。【Extra Large Capacity】The Matein expandable carry on travel backpack features a 40L-52L capacity and multiple pockets, making it the perfect carry on backpack to organize your essentials. And it comes with 2 packing cubes to keep items organized and easy to find. 【Convenient USB Port】Stay connected on the go with the external charging port & built-in charging cable, allowing you to charge your devices easily. This travel backpack is also equipped with a luggage strap, providing added convenience when traveling through airports. 【Waterproof Design】The surface of the backpack is made of waterproof polyester, which can be used in any complicated weather and can protect your items from getting wet. 【Separate Shoe Compartment】Our lightweight travel backpack with shoe compartment has 2 breathable holes is built into the bottom of the travel backpack carry on to keep shoes and other clean items separated. Shoes pocket can hold 5-14 sizes of women\'s shoes. 【Anti-theft Design】The hidden anti-theft pocket on the back of the backpack can protect your valuables from thieves. And the carry on backpack for men and women is padded with cushioning cotton to protect your laptop and other belongings.