A "carry-on bag" is a type of luggage that is designed to be carried onto an airplane and stowed in an overhead compartment or under the seat in front of you. However, there are many synonyms for this term that can be used interchangeably. These include terms such as "hand luggage," "cabin baggage," "carry-on luggage," "carry-on suitcase," "carry-on backpack," and "personal item." Each of these terms may be preferred by different people or in different parts of the world, but they all refer to the same type of luggage that you can bring into the airplane cabin with you.