No, the Xiaomi X20+ needs the dust bag as it automatically empties/suctions the container in the vacuum cleaner in the station after each suction process.

Okee I have to thank you. I know one but it's a bit too expensive for me to start with

So this robot will move around and vacuum without a dust bag. The base station has one, which the robot fills little by little at the end of each cleaning session. Does it work without a bag in the base station? I haven't tried it.

Hello,
This one is not compatible without a dust bag. To the best of my knowledge, I don't know of any robot vacuum cleaner/washer without a dust bag.