Vacuum cleaner filter bag

摘要

Vacuum filter bag (1) with a bag wall provided with an air inlet opening comprises an inner quadrilateral, especially rectangular material layer (5) that is completely connected to the bag wall on three side edges (6) and partially on the fourth edge so that during operation of the vacuum cleaner the upper side and under side of the material layer stand at least partly away from the bag wall. Preferred Features: The material layer is a flexible material, especially a filter paper, a fleece, especially an extrusion fleece or an air-permeable foil. The filter bag is a flat bag.