Miele's patented Type U FilterBags™ feature 9 layers of electrostatically-charged material and a spring‐loaded, self‐locking collar. These large-capacity vacuum bags hold 5.45 quarts of dry debris. The AirClean™ HEPA HA30 filter captures 99.99% of dust, dander, allergens and other lung-damaging particles. It is ideal for allergy and asthma sufferers and only needs to be replaced approximately once a year. The performance pack includes 16 Miele Type U FilterBags™ and 1 AirClean™ HEPA HA30 filter.