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Thats because they doNot a valid youtube URLEven the copy hepaflo type ones cant cope, there's just so much airflow that the fine dust is pulled straight through! Seen it so many times now!They are the only vacuum I have seen it on more than once though, everything else seems fine, although apparently Numatics can do it with the pattern hepaflo bags, but I've not really used one enough to reliably compare.
Non genuine ones. You can get away with them on alot of vacs, but not miele, the airflow is too great and it pulls all the fine dust out of the bag and into the motor
... removing the hose and ensuring the plastic dust flap is open and not closed.