WORKSHOP wet dry vacuum bags are designed to collect dry, everyday dirt and fine particle debris like drywall dust in a convenient to dispose of bag. While they are not required for a vacuum they can make debris disposal quicker, faster, and cleaner. These 4 wet dry vacuum cleaner bags fit WORKSHOP 3-4.5 gallon shop vacuums as well as the 5-gallon WS0500VA. Not for wet use. A cartridge filter should always be used in conjunction with shop vacuum bags to protect the vacuum in the event of a bag tearing.