Before you board your Frontier flight, ensure your bag meets the Frontier Airlines Personal Item Size requirements. Frontier allows one free personal item, but it must fit under the seat in front of you. If your bag exceeds the size limits, you may face extra fees at the gate. Use this handy checklist to measure your personal bag size Frontier and avoid last-minute surprises. Whether you’re packing a backpack, purse, or laptop bag, staying within the Frontier Personal Item Size guidelines will help you travel stress-free. Pack smart, save money, and breeze through airport security!