The new Miele FJM HyClean vacuum bags are an improvement over the earlier design. Over 80 years of experience have allowed Miele engineers to design a truly improved vacuum bag. The new design employs nine levels of filtration, improved air flow, high strength netting, and up to 30% improved performance and design over its predecessor. A new self sealing collar locks dust and contents inside of the dust bag so they do not escape into your home when replacing bags.