Idea is that you throw away the bag and deep clean the rest.
We tried to do that the other day, we just ended up doing an RSI with no vents. the plastic bag is kind cumbersome. A lot of people aren't taking the precautions seriously anyways. Some circulator kept taking off the N95 during the case, then keeps opening the front door instead of using the anteroom. So at this point i'm just accepting that i'll get SARS-COV-2, just a matter of time.