I heard on Country Squire Radio that when you cellar tobacco, optimally there should be as little air as possible in your mason jar. I haven't been able to find 2 oz. mason jars, so I've been using 4 oz jars. In order to reduce the amount of air in the jar, could I use cotton balls to take up the extra space? Or would that be bad for some unforeseen reason? Just curious. Thanks.