We first purchased these bags in May 2001. worked fine. (I didn't throw away the old bags, not the Hoover bags.) The next time the bag needed changing, the lady who cleans the house (without our knowledge) installed the bag we had previously used. My wife, who is very sensitive to house dust, noticed the difference. After a very short time my wife said she could smell dust when the vacuum was running. I replaced the bag in our vacuum's back with a Hoover bag and the problem was solved. Although