Carry-on bags will be subject to a size limit of 40 x 30 x 20 centimetres. Australian budget airline Jetstar will remove its seven-kilogram carry-on baggage weight limit on flights from February 2027. From Feb. 2, 2027, carry-on bags will be subject to a size limit of 40 x 30 x 20 centimetres. Jetstar CEO Stephanie Tully acknowledged that weighing carry-on bags at the airport is “frustrating” for both customers and crew. Meanwhile, Frontier Airlines includes one free personal item measuring 14 x 18 x 8 inches (roughly 36 x 46 x 20 centimetres) that must fit under the seat.