Carry-on luggage refers to the small bags or suitcases that passengers are allowed to bring onto an airplane. This type of luggage is typically stored in the overhead compartments or under the seat in front of you. Airlines often have specific size and weight restrictions for carry-on items, which can vary by carrier. Passengers usually use carry-on luggage for essential items such as clothing, toiletries, and electronics. It allows travelers to keep important belongings close at hand during the flight and can help avoid checked baggage fees. Many people prefer carry-on luggage for its convenience and speed during boarding and disembarking.