Expandable & Large Capacity Travel BackpackThis extra large travel backpack with expandable feature offers you more packing capacity, which can easily accommodate 3-5 days' worth of clothing, documents, a 15.6 inch laptop and A4-sized files in the main compartment. This carry-on backpack combines functionality and ample storage capacity, making it an ideal companion for travel and business scenarios. Functional & SafeA luggage strap allows backpack fit on luggage/suitcase, slide over the luggage upright handle tube for easier carrying. The backpack's fashionable with metal locking clasp front zippered pocket allows you to keep small items organized. Airline ApprovedThis travel backpack fits perfectly under the seat on the plane or under the overhead luggage rack without paying extra for the flight. At checkpoints, the large travel backpack can be freely unfolded 90-180 degrees, allowing you to quickly pass through airport security a