Miele's revolutionary new AirClean™ dustbag offers unbeatable advantages which really enhance the performance of the Miele vacuum cleaners. First and foremost, the unique new material which composes HyClean dustbags has made significant progress in the quality of filtration Thanks to its intricate web of three-ply random-spun polymer fibers, far more tiny particles and allergens are retained than with conventional dustbags. This alone accounts for a reduction in dust emissions from the dustbag of up to 50%, based on levels which were already extremely low. Therefore, this vacuum's secondary filter and high efficiency exhaust filter will be kept cleaner, providing outstanding cleaning performance with reduced resistance to the air flow.