I've run shop vacs for years without any bags at all. I can see the need if you're in a super clean environment and are trying to keep the dust to a bare minimum, but I live in the desert where dust is a way of life.
Pete, you always have good ideas for hobbies and the workshop. I would be interested in how young you are, I'm 49 and would estimate you to be between 55 and 60 years old 😁. Greetings Marco