So I just invested in a serious stash of baccy and a 12pk of 4oz ball jelly jars. I was thinking, oh 4 oz I can fit all my stuff in them individually. But then realized the jars are 4FLUID oz, where the baccy is by weight. I've seen some of you brothers us them, which is how I got the idea in the first place. How much do these little bad boys actually hold?