The 3M™ vacuum bag cover (PN28303) holds and protects the 3M™ vacuum bag insert (PN20338), a paper bag that collects dust created by sanding. Designed for use with 3M™ self-generating vacuum tools. Our black cloth 3M™ vacuum bag cover is 9 in wide and 12 in long and protects the paper vacuum bag from moisture, grease and dirt. One of the family of 3M™ accessories designed to work with a self-generated vacuum style 3M™ orbital or 3M™ random orbital sander, this accessory allows our dust collection tools to boost productivity, increase abrasive life and reduce rework. Dust collects on the abrasive surface, becomes a layer between the work surface and the abrasive and fills the air you breathe. When you collect and evacuate the dust, you - get better finishes, get longer abrasive life, breathe cleaner air.