High-quality non-woven filter bag, cleans dust deposits inside the filter bag automatically. Switching on the mobile dust extractor puffs up the SELFCLEAN filter bag. Switching off the mobile dust extractor collapses the bag, removing dust deposits inside the SELFCLEAN filter bag. For longer cleanliness and consequently a more sustained high suction power. This enables work to be carried out efficiently, cleanly and systematically. The Festool filter bag also serves as a pre-filter and is able to trap dust particles down to five millionths of a meter, or 5 microns. By arresting these small particles, in addition to larger chips, the bag extends the life of your main HEPA filter, reducing wear and tear as well as the expense of frequent filter replacement. Bag disposal is quick and mess-free. An integrated closure on the bag shuts the opening to prevent spilling. The material is made to be tear resistant and prevent bag failures which can be messy to clean up.