Maintenance Pack for the Proteam Sierra Backpack Vacuum Cleaner. This maintenance pack includes 20 Genuine Bags for the Sierra (The bags are Disposable and designed to keep dust and allergens inside of your vacuum.). 1 Micron Cloth filter (The cloth filter is reusable and washable, the Micron also helps collect airborne particles and helps improve air quality as well.) and 1 round Hepa filter (HEPA filtration is 99.98% effective at keeping dust and allergens out of the air. This filters down to .3 microns and is washable.).