If you have one of those old Mighty Might canisters, get these bags. Before installing my new bags, I took out the filter from behind the bag and gave it a good wash and then let it dry completely before reinstalling it. Then a new bag came. These bags fit perfectly. The vacuum cleaner works great. By the way, those old Mighty Might vacuums have a more powerful motor than my new Mighty Might and they definitely move a lot more air and dust/dirt than the newer models. My old model also has chrome steel tubing instead of the newer plastic tubing. It just looks cooler. LAUGH OUT LOUD. And the flexible hose is more flexible than the new models. Also, the cable is much longer and thicker than the new models. Treat your old power well and it will last.