Ryanair does not include pieces of checked baggage in the price of your tickets. If the passenger wishes to check in a suitcase, he must pay the corresponding fee. Weight is limited to 15 or 20 kg. You have all the information in: «Checking luggage with Ryanair: weight, requirements and other characteristics«.
You have all the information in: "Checking luggage with Ryanair: weight, requirements and other characteristics".