I can’t recall how long ago my former other half purchased these. It was a good purchase that sat in drawer longer than it should have. Last year when a glass jar slipped out of my hand. For some reason I remember these hadn’t been put to use. Guess I figured covers might provide a better grip.
I’m all for reducing plastics use. So having these as natural lids achieves that goal. I’d venture a guess it helps contents to get cold refrigerator air which might help preserve food a bit longer.
These were purchased at Old Capitol Farmers Market Springfield Illinois if my memory is working correctly today.