The maximum size of luggage that can be checked for free on international flights is generally 28 inches, but the requirements of different airlines may be different, depending on the airline. Airlines generally stipulate that "the sum of the three dimensions of a suitcase cannot exceed 158cm", and 28-inch suitcases generally meet this requirement.

Maximum size of checked baggage for international flights.

In order to ensure the safety of checked baggage, it is best to lock the suitcase.

For the sake of safety, it is best not to carry cash, jewelry, securities, valuables, etc. It's in the checked baggage to avoid losing it.

Sticking personal signature and other signs on the outside of the checked baggage can facilitate the search for luggage and prevent it from being taken by mistake.