Hand luggage, also known as carry-on baggage, refers to the bags or suitcases that passengers are able to bring on board a plane and store in the overhead compartments or under the seat in front of them. Other synonyms for hand luggage include cabin baggage, carry-on luggage, and portable luggage. These terms are often used interchangeably and have the same meaning. Some airlines may have specific size and weight restrictions for hand luggage, so passengers should always check their airline's guidelines before travelling. Regardless of the term used, hand luggage is an essential part of air travel and can often make the journey more convenient for passengers.