Consider using old ammo boxes with a silica drying agent packet inside. The boxes are ultra portable and perfectly fit a PSA/SGC/BVG case. The best feature though is that they are designed to resist moisture and most of the re-habbed cases on the market have their gaskets replaced.
Gander Mountain has them at their Going Out of Business sale for $15. Not a bad way to add that extra measure of protection for the cards you don't keep in a security box at the bank.
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