Backpacks, shoulder bags or laptop bags that are suitable as hand luggage on board the aircraft. All meet the 56 x 45 x 25 cm size restrictions imposed by most airlines. However, keep in mind the dimensions of the fully loaded backpack. Some larger backpacks may need to be slightly compressed to meet size limitations. We also recommend that you find out whether the airline you are traveling with has its own size restrictions for carry-on baggage, which may differ from standard dimensions.