50L Expandable Travel Backpack TSA Flight Approved Laptop Backpack Weekender School Bag with USB Charging Port Features: 1.Carry on Backpack Airline Approved, Saving Fee:This large capacity travel backpack is the perfect piece of cabin hand luggage for your travels. It is a convenient under seat flight bag.After expand,the backpack size is:18x14x8inch.It is the maximum allowed size you can take for free in the cabin when flying with spirit airlines. 2.26-50L Expandable and Large Capacity:This extra large travel backpack with expandable feature offers you more packing capacity.Before expand,the carry on backpack size is:18x14x6.5 inch;after expand,size is 18x14x8 inch.Weight:1.9 Ib (900g) .