I store mine in 2 1/5 X @ 2 1/5 Cardboard/Mylar flips. But I'm switching over to 39mm, foam ring, air-tites. I had a bunch of Mylar flips that I had no pages for, so I stored them upright, in rows, in a box. After less than a year, the mylar windows began sticking to each other. It didn't affect the chips, but it was worrysome.

I want to preserve my chips for future generations.

One day I'll be gone, and the only thing left behind will be my Chips and Ancient Roman Coin collections. I want to make sure they arrive in pristine condition!