It has nothing to do with the fuel cost. This is what ryanair's website says about oversized luggage: "Passengers who bring an oversize bag (over 55x40x20cm) to

It has nothing to do with the fuel cost. This is what ryanair's website says about oversized luggage: "Passengers who bring an oversize bag (over 55x40x20cm) to the boarding gate will either have their bag refused or, where available, placed in the hold of the aircraft for a fee of £/€ 70.00 - £/€ 75.00." Ryanair earns every time they identify an oversized bag at the boarding gate. They just share some of that money with their staff.