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<p>[QUOTE=&quot;gatzdon, post: 254272, member: 8247&quot;]Airtites (and most plastic cases) would have a Petri effect that would prevent dust/particulate and most contaminates from coming into contact with the coin (contaminates that require convection to move around).&nbsp; What they won&#039;t protect against is any contaminates that moves by osmosis.&nbsp; This would include moisture and chemical vapors.&nbsp; Some chemical vapors can even migrate through the plastic case (although I would doubt any of us are storing our coins in such an environment).&nbsp; Having an unspent dessicant packet in a relatively sealed/stable environment is usually sufficient.&nbsp; </p><p><br /></p><p>Emphasis here on stable.&nbsp; Rising/Falling Temperatures cause air to expand/contract.&nbsp; When the air contracts following an expansion, your airtite &quot;sealed&quot; holder literally sucks air into the holder bringing any airborne contaminants with it, not just moisture.[/QUOTE]</p><p><br /></p>

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