SAMANTHA BOMKAMPNEW YORK (AP) â¿¿ Putting a bag in the overhead bin will soon cost some Spirit Airlines passengers $100. That's more than they may have paid for their tickets. The Miramar, Fla., airline currently charges $45 for a carry-on bag. As of Nov. 6, customers who wait to pay the fee at the boarding gate will fork over $100. Any bag that needs to fit in the overhead bin is considered a carry-on. A small bag that fits under the seat is free. The price for a carry-on paid for at an airport kiosk will increase to $50 from $40. Larger pieces of luggage checked at the airport will cost between $8 and $10 more, while the fee for bags checked online will rise by between $2 and $5. Spirit also will increase a handful of other fees by between $2 and $10. Spirit is one of two airlines that charge for carry-ons. Allegiant is the other. In the first quarter, Spirit's average revenue from fees per passenger on a round-trip flight topped $100 for the first time.