A backpack power tool has drive motor and blower mounted on a backpack frame. The bottom plate of the backpack frame has a passage for working air sucked in by the blower. Ribs on the bottom side of the bottom plate have end faces forming a contact surface for leaves aspirated in blower operation against the bottom plate. The bottom plate has intake openings positioned between the end faces of the ribs in the contact surface and fluidically connected to the passage. Working air is sucked in through the intake openings and the passage. The bottom plate has an intake surface that is the sum of surfaces of all intake openings and of all end faces of ribs with a width of less than 10 mm positioned between the intake openings. The intake surface amounts to at least 50% of the surface of the bottom side of the bottom plate.