I cannot vouch for their effectiveness over the long haul, and use at your own risk, but I have always used ziploc storage baggies to hold stacks of slabs within my safety deposit box. I typically double bag stacks of 20 with the larger ziploc bags (I don't use the ones with the little slide lever, but rather the bags you have to pinch across the seam to lock completely. Some bags even have a double seal).
Cardboard is fairly resilient over time to the elements, but why chance it?
Last edited by CW; 09-28-2014 at 07:48 PM.
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