I've said this before here. I have a set of 65T more or less NM. I had it in a 3-ring binder, mostly Ultra Pro pages, stored vertically, for about 25 years. Gravity (I guess) caused the tops of the pages to pull away from the binder spine and curl the top left cards.
I took all the top left cards out and pressed them down. Probably not NM anymore but none got creases, so the damage overall was minor. I now lay the binder flat.
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