I'm the guy zunismoke speaks of above who tried to answer his questions.
I have a novel approach to cellariing tobacco. I age it for 5 or 10 years to get it right as I truly adore aged tobacco. Then I decide I'm going to quit smoking and sell everything I have to savvy guys like zsmoke at a sizable loss. Then I change my mind and start smoking again and have to buy back, at the current higher prices, the tobacco that I sold. I then decide to cellar this tobacco as I still want it aged.
Though some might say this a circuitous approach, I love buying tobacco, and in the end I feel blessed
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Oh, and as regards the OP's question, no one knows enough about aging to have an opinion about a loose or tight pack inside jars. Oxygen is, however, essential, as is moisture. If the moisture is too high or low, correct this before jarring, and in the end aging will be less than optimum without moisture's contribution to fermentation. I agree that the truth of aging is revealed in the smoke, but here too I would be careful as it is impossible to really assess aging's outcome. You have no baseline of optimally aged tobacco against which you can compare the batch in question, nor can science tell you know how much the tobacco has changed.
All you really have is the accuracy of your palate, which is another non-measurable, subjective entity.
I recommend wide-mouth pint jars as the ideal vehicle for aging as they are easier to load and can be filled with a goodly amount of tobacco sufficient to keep you puffing for a significant period of time. You can age it for however long tickles your fantasy, open and smoke it without disturbing the other jars of this tobacco that you jarred. I feel this is better as I have an unprovable bias for uninterrupted aging; used to be that Mr. Pease advocated this but no more. But to me undisturbed aerobic aging is better as if you open the jar, the anaerobic aging that was humming along immediately reverts to aerobic aging at the introduction of air. I consider the best aging as exhausting the available O2 in the jar, aerobic aging, and then dropping into anaerobic until you open that jar. This is a more steady chemical process. But Mr. Pease says that uninterrupted or interrupted aging produce will be different but equal results.