Frontier Airline Personal Item Size including handles, wheels, and straps, cannot be larger than 14 inches by 18 inches by 8 inches (35 cm by 46 cm by 20 cm), according to their most recent policy. This usually comprises laptop bags, briefcases, handbags, and compact backpacks. Any item that exceeds these limits might be deemed a carry-on, which carries extra costs. Travelers should measure their personal belongings before leaving for the airport to avoid additional fees.