The Dustless Technologies 12-18 Gallon HEPA Wunderbag Micro Pre-filter Bag (D1351) is a versatile wet+dry debris collection bag for nearly all shop type vacuums.  It's made of HEPA material that filters down to 0.3 microns at 99.97% efficiency.

The flexible gasket accepts vacuum ports ranging from 2" to 2-3/4" in diameter. Its sealable cap and durable synthetic material means that you can vacuum wet and dry debris of any variety and keep the contaminants held safely inside the bag.