Since is cheap (is what you think), you can make that choice and select Ryanair to fly with you. But keep in mind they don't fucking care about you. In my case, I had no small bag to take with me on the plane, but a bigger one from people who make camping. Since my bag was lighter, (less than 10kilos) I pay the normal pass. On the airport I found that my bag was 10 centimeters bigger than the limits. They ask me to pay more 40€ for the 2º pack, without taking off 20€ from the 1º that I already pay.
Conclusion: Flying with Ryanair become more expensive than using a normal company.