You know, we all do stuff without thinking. I hung some onions on a hook out in the garage IN A PLASTIC BAG from the grocery, even though they were in a net bag anyway. Now why do you think onion producers ship onions in net bags? To prevent mold, of course!
I went out earlier this week to get onions and of course in my warm, damp garage they were all moldy ! Lesson learned on that one!
I save all my net bags (croker sacks, small or large) and store onions, potatoEs and things like that in them. That trick I learned long time ago.