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How to choose between a bagless and a bagged vacuum cleaner 
Determine how environmentally-friendly you want your vacuum cleaner to be. 
Bagless vacuum cleaners tend to be better for the environment. This is because they do not produce anything to throw away other than the dirt collected.
Bagged vacuums, on the other hand, may go through dozens or hundreds of disposable bags during their lifetimes. Keeping excess trash out of landfills benefits the environment.