Autoclaving disposable Petri dishes: How do you use a biohazard bag and can plastic disposable Petri dishes be autoclaved in them?

Autoclaving disposable Petri dishes: How do you use a biohazard bag and can plastic disposable Petri dishes be autoclaved in them?
Mould investigations extra questions: I have some further questions regarding the mould investigations:
1. I prefer to double bag because we have had leaking bags in the past.