As air passes through the HEPA inner bag, it captures at least 99.97% of particles at .3 microns from that air, which includes the following: pollen, house dust, smoke, animal dander and mold spores. Activated charcoal layer fights odors which are trapped in the bag Easy to install - just insert into bag dock & snap closed Saniseal automatic closing dust seal keeps dust in the bag Fits the Oreck Magnesium upright vacuum Bags hold up to 8 quarts 6 Pack