Bosch 9 Gallon Repl Bag 5-Pack is designed as a paper filter bag specifically made for VAC series 9 Gallon dust extractors. These filter bags serve as a primary filter, efficiently capturing large pieces of debris and helping to extend the life of the main filter. Using a filter bag is the most effective way to manage the disposal of collected dust and debris, ensuring a cleaner and more convenient cleanup process. Each bag comes equipped with a port cover that securely seals the opening, keeping dust and debris contained during disposal for a mess- experience.