These bags come in packs of 6, and can be found in our backpack vac bags section, and they help your Bissell 6 qt. HEPA backpack vacuum maintain a recovery rate of 99.97% at 0.3 microns. This guarantees the HEPA rating, which helps to keep your facility clean and allergen causing bacteria out. You never want to vacuuming be in the middle of cleaning, fill up a bag, and then realize you don't have any replacements. That is why it is always a good idea to stock up!