I have a kenmore cannister vac - model 275...

You know, any bag made for the unit should give similar results. You can buy a cheaper bag and that number is 50558. You can get them at your local vac shop or you can let me know, I will send you some. The price per 3 pack is only 4.95. The canister vac is made in such a way that it doesn't have much leakage. It is quite efficient with or without hepa bag. If you or anyone in your family suffer from asthma, I would recommend the use of the hepa bags. tThanks, Rene(The Vacuum Doctor)