Genuine HEPA media vacuum bags are designed exclusively for the Prima canisters and feature the light green self-sealing bag closure system for easy installation and tidy disposal. These bags meet the HEPA filtration standard of 99.97% efficiency at 0.3 microns. The self-sealing bag system makes it easy to remove and replace the bag. A rubber seal prevents dust leakage, and reinforced seams provide extra protection from bag leakage.