This Aerolite backpack is designed for amazing airline compatibility, with dimensions of 55x35x20cm and a capacity of 39L. It's perfect for everyday use and as carry-on luggage, meeting the size requirements for most major airlines in the UK, Europe, and North America, including Ryanair, easyJet, British Airways, Delta, and many more. The backpack features YKK zippers and is spacious enough to carry a 15-inch laptop.