Shop-Vac High-Efficiency Filter Bags 90671 can help you pick up fine dust from drywall cement and even cold ashes. Comes in a pack of 2. These filter bags is that they re easy to use and install with your current Shop-Vac. Instead of sucking up dust and dirt straight into your tank which soon gets filthy use these disposable filter bags instead. These make cleaning up a breeze and stops the tank from getting clogged with dirt. Instead of having to manually clean your vac simply remove the Shop-Vac filter bags from the inlet that s located on the tank. Shop-Vac High-Efficiency Filter Bags 90671 won t work with the HangUp or 5 Gallon Wall Mount Vacs. Should only be used on non-toxic non-hazardous and non-flammable materials.