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<p>[QUOTE=&quot;Bullionbound, post: 538, member: 79&quot;]For the larger items, such as proof sets, mint coin bags and coin rolls, I have been using the military ammo canisters. I throw some desiccant bags in there with a humidity indicator strip and only have to change them out every year or so. They really are air tight if they are not all bent up - be sure to look them over well. I tried a plastic commercial version and found that they are not air tight despite the rubber ring on the lid. When I put water in them and turned them upside down, they leaked like a dribble cup. I have not had any toning/hazing or spotting on any items over the last several years when they have been stored this way.</p><p><br /></p><p>On the other hand, I had some slabbed American eagle bullions in PCGS plastic stored in the blue PCGS boxes with some desiccant, while sitting in the closet this summer. I was horrified to find that almost all of my silver eagles started to spot. My newer platinums were unaffected. I had the gold further protected in a large freezer bag, thank goodness. Evidently, the humidity during the summer did its job. It is so upsetting to see my coins succumb to the environment just because I didn&#039;t take the simple steps of protecting them. Now, I am leaving nothing to chance..... I have bought the Intercept shield boxes that hold the slabs and provide an added level of protection from destructive environmental gases. Butt ugly, but they can be easily removed from the boxes for viewing</p><p><br /></p><p>http://www.interceptshield.com/</p><p><br /></p><p>These are then stored in ammo cans with desiccant packages. Short of finding a vacuumed environmental chamber, I don&#039;t know what else I could do. Even the mint is learning the hard way, having to destroy their secret stash of proof sets that miraculously appeared for further profit of a sold-out item.[/QUOTE]</p><p><br /></p>

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