I have stored my old clothes in a vacuum bag - after 12 months
- Voila, some of my clothes came out full of fungus.
I think the fact is that it is not a real vacuum where there is no air at all - there may be like just 10 cubic cm of air in the bag left, but that is still 10 cubic cm with 60%RH.
Nowadays when I vacuum my clothes, I stick in a handful of dessicant rolled up in a sock.
More than enough for fungus to thrive. Don't take the risk - your lens are definitely going to be worse off.