Eureka J Allergen Bag - Case of 18 Filtrete vacuum bags help capture household dust Captures 94-percent of all airborne pollutants larger than 1 micron in size Change bag every 30 to 60 days for optimum performance All vacuum brand and model names are registered trademarks of vacuum manufacturers Measures 1-1/2 by 8-1/5 by 9-4/5 inches