I have posted this before, I had a 1965 Topps set stored vertically in a 3-ring binder for about 25 years. The weight of the pages stressed the top left corners of the ultra pro pages and bent some of the top left cards.
They didn't crease but the corners got curved. I flattened the cards out and I don't think they show any permanent damage. But now I store all my binders flat.
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