These are 6 HEPA certified 6 Quart vacuum cleaner bags for the Perfect Commercial backpack vacuum cleaner. Certified to capture 99.97% of all airborne allergens down to .3 microns. Perfect for residential cleaning companies who vacuum homes that have breathing issues or allergies, hospitals where clean air is a life and death scenario, any application that contains lead paint, and so much more. Because these bags are a cloth multi-ply bag and capture more microscopic particles then standard paper bags, these bags will also prolong the life of the vacuum's motor as less dust passes through the motor. Designed to fit Perfect commercial backpack model PB1006, Perfect part number 15-1802. 6 High Quality HEPA Bags per package.Also can be used in the Oreck commerical backpack vacuum cleaner model XLPRO6, XLPRO6A, and XLPRO6Z. Replaces Oreck part number PK25PRO6DW.