Have the vacuum cleaner bag has always very expensive (5 pieces for 20, - Euro) purchased from the Vorwerk representative. The original bags are somewhat larger. The slight difference in my opinion is not important, considering the large price difference. Important for me was that they fit. I was at first, as some reviews are to the effect turned out badly, a bit skeptical. I have the Vorwerk Kobold VK 140, and it fit perfectly. The purchase was no problem, the shipping fast. Here I can give a strong buy recommendation.