The bags are useful, but I think the size of the bag should fit the canister better. Due to its size, I had to fold the bag a bit to fit and the vacuum to work properly. It seems to me that the buildup restricts airflow and makes the vacuum cleaner work harder. This idea was proven to me when the vacuum cleaner overheated and suddenly shut off. I thought the bag was full but when I checked it was almost empty. Whatever bag was in the vacuum when I got it (used) it was much better and fitβ¦