Swirl saves on an important end, the bag opening. Compared to an original Miele dust bag the bag opening is not provided with a rubber seal but just a simple hole. This leads öffter ago that the dirt does not completely end up in the bag but also inside of the sucker. Luckily, there are motor filter the worse but also prevent that are not included in Swirl. I will not buy Swirl bag more. The price difference between Swirl and Miele is justified.