Eureka RR-Micro Filtration Bag, 12 Bags Treated with Ultra-Fresh for Models 61115, 63295 and 62437 EUREKA 4870 Series Uprights, including Boss Smartvac Uprights 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