When using the CT Dust Extractors with routers and planers, or any activity that produces large shavings or wood chips in volume, filter bags are going to fill up faster than when you are producing fine dust, such as in sanding applications. If you find that you are replacing filter bags often under these circumstances, then it might be time for a Longlife filter bag . Designed with a non-stick, micropore plastic lining, the Longlife filter bag can be used over and over again, up to 500 times. The Longlife filter bag saves money on filter bag replacement while offering a convenient and easy means to capture and dispose of large wood chips. Not recommended for use with the fine dust creating by sanding. Includes 1 Longlife reusable filter bag.