I bought these heppa packs to make covid masks at the start of the pandemic. I used the University of Florida design - very simple! The effort was definitely worth it, especially since there were practically no ready-made masks at the beginning of the pandemic. And the Heppa filter material filters out the larger molecules of the Covid virus, so not only does it protect those around me from virus or bacteria from me, but it also protects me from OTHERS better than a surgical mask.