Currently, there are no uniformly enforced airline restrictions concerning carry-on luggage.
Most carriers state that the bag must fit in the overhead bin or under the seat in front of you. The usual maximum measurements are said to be 55cm x 35 cm x 22 cm (non-metric: 22 X 14 X 9 inches), but many folks continue to exceed that and are allowed to do so. At most airports, there are bag checking " frames " that you can insert your carry-on into to see if it meets these " quasi-requirements." Enforcement seems to be uneven at best, and often totally lacking. If in doubt, be prepared to be asked to check your carry-ons
Carry-on is the unchecked baggage.
Carry-on is the luggage that is permitted to be brought on to the aircraft by the
List of books: carry-on