From the air your vacuum pulls through the bag, Filtrere Micro Allergen vacuum bags capture 94% of particles larger than 1 micron size, including dust mite debris, grass, and ragweed pollen. They also capture 57% of particles between 0.3 and 1 micron in size, including household fibers and other microscopic allergens. Fits models: Eureka Mighty Mite 3670 and 3680 series canisters made after 1996. Sanitaire commercial canister, including S3681, S3686, and SC3683 models. 3 bags per package.