The Hammacher Schlemmer Institute tested leading bagless vacuums and this one proved to be the best because it quickly removes debris from tile and carpet in one pass and creates powerful suction. The best bagless vacuum quickly suctioned cereal, lint, flour, and pet hair and did not leave behind remnants, while lesser models merely pushed the detritus around and required multiple passes to remove flour and lint. Unlike typical vacuums that release some dirt back onto the floor, the best bagless vacuum's patented WindTunnel technology creates two powerful air streams that trap debris and channel it away from the floor for superior cleanliness. The unit's brushes spread carpet fibers and enable the vacuum to remove deeply imbedded pet hair and dirt. Scoring highest for features, the vacuum has a 15" wide cleaning path, a HEPA filter that captures 100% of dust mites, ragweed, and grass pollen, and an easy-to-empty, bottom-release dirt cup that eliminates the need to replace paper bags. Includes attachments for cleaning upholstery and crevices, a 14" extension, and a powered, rotating hand brush. 43" H x 16" W x 14" D. (23 lbs.)