TSA-FRIENDLY & MULTIPURPOSE:At checkpoint,unfolds the freely 90-180 degree making you quickly through the airport security and keep items tidy, exclusive designed for AIRPLANE TRAVELING. Served as everyday backpacks,school backpack for teen boys/girls, high school student backpack or spacious college backpack for men, professional backpacks for laptop. Occasional international travel, Overnight backpack Camping, Hiking back pack with the large capacity usb charging backpack. USB Charging Port: Travel backpacks with charging ports make it easy to charge your phone and other electronic devices such as Kindle devices and all USB devices. (excluding portable power packs) It can be served as everyday backpack,spacious college bookbags or high school student backpack, professional backpack for laptop or daily use at anywhere for weekend getaway,occasional travel backpack. The Add-a-bag system makes it easy to place your backpack on the luggage cart system. Whether it's walking, outdoor travel, or boarding a plane, it's a good fit.