WORKSHOP dust collection bags are designed for dry, everyday dirt and fine particle debris like drywall dust. While they are not required for a vacuum, they allow you to collect the debris and dispose of it quickly and easily without having to breathe in dust that's created when dumping a drum without a bag. Reduce vacuum maintenance time, and breathe easier with WORKSHOP dust collection bags. Fits 3 to 4.5-gallon WORKSHOP wet/dry vacs except the WS0400SS. Includes 2 bags.