Yes, you can book a 20kg checked-in bag on Ryanair, but it must be purchased as a specific add-on. As of 2026, Ryanair offers three primary "hold" luggage tiers: a 10kg check-in bag, a 20kg check-in bag, and an occasional 23kg option for certain routes. It is significantly cheaper to add the 20kg bag during the initial booking process than to add it at the airport, where fees can exceed £/€70 per bag. A 20kg bag allows you to pack significantly more than the standard "Priority" 10kg cabin bag, but you must ensure it does not exceed the maximum dimensions of 80cm x 120cm x 120cm. Ryanair also allows "bag pooling" for passengers on the same booking; for example, if two people both book a 20kg bag (40kg total), one person can bring a 25kg bag and the other a 15kg bag, provided no single item weighs more than 32kg for health and safety reasons. Always check your digital boarding pass to ensure the 20kg allowance is correctly displayed before arriving at the bag drop desk.