Backpack blowers are more commonly used by professionals and are mostly powered by 2-stroke gasoline engines. The harness, which has a blower fit into it, is worn on the operator's back. The engine and fan are also placed on the backpack frame with a hand-held hose and spout to direct the airflow. Backpack ... . Since these blowers are very powerful, they are typically used for larger areas, and tough jobs like wet matted leaves. They are most suitable for commercial uses.