For my Felix I needed new filter bags and was surprised to see that Sebo has changed the filter bags. It no longer concerns the previous usual "paper" -Filterboxen, but the new filter boxes are made of white micro fleece. On handling the filter bags has not changed. The new bags appear on the quality properly, all processed well. The everyday use has yet to confirm this, however. Negative falls on, however, that in the previous filterboxes of Sebo per pack of 10 were included, after switching to the so-called "ULTRABAG" the content has now been reduced to 8 (at the same price of course). For this reason, there is a point deduction for me.