I have a HOOVER Commercial backpack vac
It's packed away at the moment, or I'd post a pic. Mine is just like a canister cleaner. It has the black straps, all the tools, etc. It does a great job. It puts the power of a canister on your back. I'd imagine that, after a while, it might get tiresome, but the convenience is very nice. I guess that's the 'trade off.'
John