The KOBLENZ 12 and 16 Gallon High Efficiency dust collection bags are specially made for stainless steel tanks which conveniently captures everyday dirt, dry debris like sawdust, sand and other dry messes. They help contain all the debris from your home improvement projects, big or small and keep your vac from blowing the fine particles back into the air. Bags are easy to install by attaching to the vacuum port inside the tank without needing tools and are even easier to toss away. Its much more convenient using a bag to catch the debris versus dumping and cleaning the entire tank each time the vacuum becomes full. Includes 3 high efficiency collection dust bags.