Envirocare Micro Filtration vacuum bags perform 99.7% filtration and traps micorscopic particles and allergens. Allergy sufferers may have drastic improvement using Micro Filtration bags when vacuuming. Individual bags use electrostatic liner that captures a wide range of dust particles including many pollens, spores, bacteria, dust mites, and allergens. Each bag has dust hole sealing sticker that prevents pooping dust when changing bag.