Vacuum Cleaners Discussions

I have a Kenmore Can. From what I've read, it isn't sealed suction. Wonder why Kenmore chooses not to do this to their can's? Does the hepa bag make up for it If it isn't sealed, the air doesn't all exit out the hepa filter, right? Do the Electrolux metal can's have sealed suction? If you use a hepa cloth bag in a non sealed canister like an old metal lux can, would that keep down emissions? I'm looking for a canister, that is as easy to use as Kenmore cans but more reliable. I can't seem to find prices on Riccar or Simplicity online. I'm afraid anything I'm asking for here is gonna run into the 800 dollar and up range. I definitely don't want an upright or bagless. The Kenmores are sooo easy to use I just wish they were more reliable.