Miele FJM Synthetic Micro Filtration Bag, 5 Bags Treated with Ultra-Fresh and 2 Filters for Model 09338520 MIELE (S241-S256i, S290-S291, S300i-S378, S4000-S4999, S500-S578, S700-S758, S4, S6 Series) Canisters Micro Filtration vacuum bags also capture 99% of particles 5 microns in size, including household fibers and other microscopic allergens The Ultra-Fresh finish on these bags protect against odor and stain-causing microbial growth; This helps keep your bag cleaner and fresher Ultra-Fresh treated bags are guaranteed from defects