MicroFresh vacuum bags cost more than those that come in a package of ten, and they fill up faster. I changed an old MicroFresh bag from the vacuum to replace it, and there wasn't any dusty smell, nor was there any powdery white material all over the inside of the vacuum cleaner cover. This is because MicroFresh bags catch the fine particles that regular bags cannot, a great benefit for those concerned with their health and breathing. Just knowing what the regular bags leave behind will convince most people to go with the MicroFresh bags, even though they cost more.