I once had an opportunity to vacuum 40,000 square feet of carpet for the US Olympic Gymnastics Convention in San Jose. Fortunately, I had a couple good friends help me out for that weekend. Unfortunately, I was just starting out and had only a couple Hoover upright vacuums to get the job done. Needless to say, it took two people about six hours to vacuum the San Jose Convention Center floor. Had I known about backpack vacuums, the job would have went a lot smoother and quicker.
Shortly after that experience, I purchased my first backpack vacuum cleaner. It was a Powr-Flite BP6S Comfort Pro Backpack Vacuum with 6 quart Capacity. I opted for the smaller 6-quart version with the idea of expansion in mind. If I hired some one smaller than myself, they would need a backpack that would fit. Besides, if the fit was better, it would be ergonomic, and the likelihood of a worker’s comp claim would decrease. The disadvantage of the 6-quart, however, is that you must frequently change the bag.
Besides the Comfort Pro’s actual comfort, it had tremendous suction. So much so, that the TurboCat turbine attachment (sold separately) turned as if it was electrically motorized. Picking up crumbs, hair, peanuts, etc. is no problem with this machine.
One of the few complaints I have about the Powr-Flite BP6S Comfort Pro Backpack Vacuum, 6 quart Capacity is that the cheaper, generic bags do not fit the canister unless you do little modification of your own. A pair of scissors and a minute is all it takes to make for a proper fit, but in a business when time is the overall maker or breaker of profit, the less steps the better.
Overall, I would buy a Powr-Flite BP6S Comfort Pro Backpack Vacuum, 6 quart Capacity again. It is a good value with really good comfort which is important for those larger areas that may take a while.