The maximum size for carry-on luggage at Brisbane Airport is determined by the airline and may vary depending on the flight and destination. As a general rule, most airlines allow carry-on bags with dimensions of up to 55 cm x 40 cm x 23 cm (22in x 16in x 9in) and a weight of up to 7 kg (15 lbs). Passengers should check with their airline to confirm their specific carry-on luggage allowance before traveling to the airport.