Miele's patented Type FJM FilterBags™ feature 9-layers of electrostatically-charged material and a spring-loaded, self-locking collar. These vacuum bags hold 3.7 quarts of dry debris. The AirClean™ HEPA HA50 filter retains 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. This performance pack includes 16 Type FJM FilterBags™ and 1 AirClean™ HEPA HA50 filter.