"Jim Behning" wrote in message
...
My little Jet 650 has a plastic bag on the bottom and a canister
filter on top.

The canister filter is designed to handle the rated cfm of the blower. if
the bag on top is oversized and can handle the cfm, it would be acceptable.
If not, you are restricting the capability of the machine.

I find it easier to take the bag out when it is only about half full. I
won't bore you with what happens when it is overfilled.