Carry-on bags refer to the type of luggage that air travellers take with them on the plane. There are several synonyms that can be used interchangeably with carry-on bags, including cabin luggage, hand luggage, carry-on luggage, and cabin bags. Other similar phrases include overhead luggage, onboard baggage, and stowaway bags. Regardless of the term used, these bags must comply with specific airlines' size and weight requirements, and passengers must ensure that their carry-on bags do not contain any prohibited items. Carry-on luggage is vital for all travellers, as it contains essential items that can be easily accessed during the flight and also prevent the loss of the traveller's luggage.