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<p>[QUOTE=&quot;howboutatrade, post: 2036687, member: 10387&quot;]Truly airtight...probably not...anything that can be opened probably allows a little air in over long periods.&nbsp; Slabs are completely sealed for reasons and one is that it keeps air out.</p><p><br /></p><p>Circular airtights are probably better from that perspective.&nbsp; They seal all the way around.&nbsp; The square have seals on the sides, but the corners are not...easier to open at that point.&nbsp; The squares seal in roughly the same way as a US Mint proof set. </p><p><br /></p><p>My coins stay in a climate controlled environment (house), so the material is not going through large swings in temperature, humidity levels, contaminant changes.[/QUOTE]</p><p><br /></p>

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