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<p>[QUOTE=&quot;Mike Thornton, post: 4382484, member: 105289&quot;]Phil I would have to disagree, at least for long term stroage.&nbsp; That said, I have some mint sets stored in zip lock bags.&nbsp; My concern is that all plastics &quot;off gas&quot; over time.&nbsp; What gases, depends of the type of plastic.&nbsp; Some are more stable then others.&nbsp; Today, more and more of the plastics we encounter are designed to breakdown faster then plastics from the past and off gassing is part of that process.&nbsp; These are more often trash and grocery bags, for environmental reasons.&nbsp; My other concern is that it&#039;s nearly impossible to seal a zip lock bag without trapping some air and thereby moisture in it.&nbsp; Remember the air we breathe contains moisture (humidity).&nbsp; This moisture can condense when temperatures decrease.&nbsp; Try this experiment.&nbsp; Take an ordinary zip lock back.&nbsp; Trap some air in it and toss it in the freezer.&nbsp; In about 30 minutes, take it out and see if you have ice crystals.&nbsp; Now, yes its an extreme experiment, but illustrates the point.&nbsp; If your wanting to store and protect from moisture, use vacuum/seal bags.&nbsp; And if you have access, a desiccant pouch wouldn&#039;t hurt either.&nbsp; At least your removing nearly all the air and thereby moisture from the sealed bag.[/QUOTE]</p><p><br /></p>

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