These bags seem to work just as well as the name brand bags for a fraction of the price. My guide is smell. If I don't feel anything when vacuuming, the bag is doing its job. HEPA-free bags cause an unpleasant odor when vacuuming, even if they are made under the Riccar brand. Buying vacuum cleaner bags isn't the smartest thing to buy, but if you want to vacuum, you need to buy one. these works.