Why sell filter bags for mini/midi model 2019 like the same size when one suppos to be bigger than the other one.. the same for longlife bags.. I don't catch it yet .. in the old model you can choose mini or midi

As far as making one bag for both units that is something Festool decided to do. What I can tell you is that the bag is bigger for the Midi and will fill all of the way. As for the Mini, the bag will fill until it expands to the size of the tray cavity.