As with most things in life, there is really nothing free. The two most claimed advantages to bagless vacuum cleaners were lower operating costs and better performance. As far as the cost issues go, all vacuums must filter the exhausting air they use to carry the dirt into the collection area, as they would otherwise simply pick the dirt up from the floor and spit it right back out.
Everything that a vacuum picks up, no matter what type it may be, needs to be deposited somewhere – normally in a vacuum cleaner bag.
Back in 1920, the Air Way Sanitizer Company of Ohio introduced the first vacuum cleaner with a disposable vacuum bag. Until that time, the bags for vacuum cleaners resembled the type of bags that golfers used to carry their clubs. They were somewhat heavy and awkard devices made out of thick, stiff canvas, designed to be very flexible and still keep dust and debris from the carpets from escaping out into the air.