Baggage sizers are devices that are used to measure the dimensions of a piece of luggage or other item being brought into an airport or onto an aircraft. They are typically used to ensure that the size of the baggage conforms to the size limits set by the airline or airport.

Queue barriers, also known as crowd control barriers or queue posts, are used to organize and manage lines of people waiting to enter an airport or board an aircraft. They are typically made of metal or plastic and consist of a base and a vertical pole with a retractable belt. The belt is used to create a physical barrier that guides people into a single line and helps to prevent crowding and disorder.

Both baggage sizers and queue barriers are important tools for maintaining order and safety in an airport environment. Baggage sizers help to ensure that all luggage meets size requirements, while queue barriers help to organize lines and prevent overcrowding. They are commonly used in airport check-in areas, security checkpoints, and boarding gates.