Carry on Luggage Size Frontier: Rules & Packing Tips

24 x 16 x 10 inches is Frontier's paid carry-on limit, with a 35-pound maximum. Your free personal item is 14 x 18 x 8 inches, and that's the bag Frontier expects to slide under the seat in front of you. You're probably standing over a half-packed bag right now, trying to decide whether it'll pass at the gate or get tagged with a fee. On Frontier, that decision...