If you do any vacuuming this is the way to go. The bags aren't cheap but they hold a lot of dust preventing clogging of the cartridge filter. Prior to using these I'd have to clean the filter several times a day and get dust and grit all over myself. With the bags, do go several days of sanding and cleanup before the bag needs replacement and the cartridge filter is relatively clean. Don't get any dirt on you when you remove the bag.