I keep mine in flips and keep the flips in those big double row boxes. I have 99 of those boxes full or almost full now.

Some of the red Chipcos I keep in airtites instead of the flips. Every new one I get goes in an airtite, but I haven't gone back yet and moved all the older ones into airtites.

I haven't seen any evidence that any of them have bled through both flips to discolor the chip next to it. But, I will do some checking. I would have NEVER guessed that they could to that in the mylar cardboard thingies. Live and learn.

Greg