There is NO limit to what size or quantity of liquids you can take in your checked (hold) luggage - as long as the liquids are not prohibited. If the suitcase you refer to is going to be checked in, you don't need to put your liquids in a 20x20cm bag and you don't need to worry about keeping them under the 100ml limit.

Yes, you can absolutely bring liquids in containers larger than 100ml in your checked baggage when flying with Ryanair in 2026. The restrictive "100ml rule" applies exclusively to hand (cabin) luggage that passes through security checkpoints. In your hold luggage, you are permitted to pack full-sized bottles of shampoo, wine, perfume, or other liquids, provided they do not exceed the overall weight limit of your purchased bag (usually 10kg or 20kg). However, there are still a few safety "guardrails": you cannot pack highly flammable liquids like lighter fluid, paint thinner, or high-proof alcohol (over 70% ABV) in any luggage. Additionally, Ryanair has a policy regarding edible oils (like olive oil), often limiting passengers to no more than one liter in total to prevent leaks that could damage other passengers' bags. For the best experience, always double-check that your liquids are well-sealed and perhaps wrapped in a plastic bag within your suitcase, as the pressure changes in the hold can occasionally cause bottles to leak, even if they aren't subject to the security-based volume limits found in the cabin.