Dust bag and nonwoven material for manufacturing a dust bag

Dust bag (4) with a formed of air-permeable filter material bag wall (15) and to one of a holding plate (6) surrounding the inlet opening (8) for the filtered suction air (10) upstream of the blower (12) of a vacuum cleaner (1), wherein the dust bag (4) containing a liquid absorbing material, characterized in that the material to the effect changed by the absorption of the water its properties in that the air throughput of the bag (4) is drastically reduced, and accordingly a user is hinweisbar the need for a bag exchange.