Safe disposal of dry, non-hazardous dust. For dusts of dust class L. Only suitable for vacuuming non-hazardous dusts. The Longlife filter bag is robust, durable, and designed for vacuuming class L dusts. Thanks to the sturdy polyester fleece material, the Longlife filter bag can be reused multiple times. Vacuum, open the closure slider, empty the filter bag, close the closure slider, and continue vacuuming. For efficient, clean, and health-conscious work with a system.