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.
Do airports actually check liquids?
Placing these items in the small bag and separating from your carry-on baggage facilitates the screening process. Pack items that are in containers larger than 3.4 ounces or 100 milliliters in checked baggage. Any liquid, aerosol, gel, cream or paste that alarms during screening will require additional screening.
Does Ryanair check liquids?
How strict are Ryanair on cabin bags?
Only priority boarding passengers will be permitted to take one small bag (40cm x 20cm x 25cm), plus a larger cabin bag (55 x 40 x 20cm) with a maximum weight allowance of 10kg into the cabin free of charge. Non-priority customers can only bring one small bag (40cm x 20cm x 25cm), that must fit into the sizer.
Can baggage scanners detect liquids?
These scanners are improved so much that they can detect drugs hidden in cavities or the body's interior. They can see all kinds of illegal drugs and cigarettes in airport scanners. Similarly, they can scan all kinds of liquids or metals through your body or luggage.