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<p>[QUOTE=&quot;GDJMSP, post: 7912904, member: 112&quot;]Some do cover the cardboard completely and some don&#039;t. But even those that do, there&#039;s still the edges which gasses can and do go through. And the mylar itself, while it a bit less air permeable than some other plastics, it is still air permeable.</p><p><br /></p><p>The bottom line is cardboard 2x2s and flips are simply a bad idea all around. And the main reason that most people use them is because they are cheaper than holders do what they should be doing - protecting the coin as best it can be protected. </p><p><br /></p><p>There&#039;s an old saying about that, and like almost all old sayings it got to be an old saying because of the truth it contains - you get what you pay for.</p><p><br /></p><p>And then of course there&#039;s the times that you don&#039;t get what you pay for, namely most of the, rather expensive coin albums - that have probably been responsible for destroying more coins than any other single reason.[/QUOTE]</p><p><br /></p>

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