The Pullman Advance Commander 900 is a carefully designed backpack vacuum cleaner that is extremely comfortable to wear and has exceptional cleaning power. The Comfort System is height-adjustable to suit all user heights, and is designed to be worn comfortably for long periods of time. To make the user experience even better, this model features patented Anti-Vibration Absorbers to prevent motor vibrations passing through to the user, and it also has a patented Active Air Ventilation System which removes hot air away from your back during use.