Designed for use with Eureka's 2270 and 2900-2920 Series vacuum cleaners, this three-pack of Micro Allergen vacuum bags captures 94-percent of all airborne pollutants larger than one micron in size, including dust-mite debris, grass, and ragweed pollen. Be sure to change the bag every 30 to 60 days for optimum performance. The three-pack of allergen bags measures 1-1/2 by 8-1/5 by 9-4/5 inches. 3 Allergen Vacuum Bags