I've told this story several times now, so skip past if you've heard it before. I had a binder of 65 Topps stored vertically, in mostly Ultra Pro pages. After about 25 years, I noticed that several of the cards in the top left position on the pages had curled corners. Gravity causes the top of the pages to try to pull away from the spine and creates stress there.
I do not store high-grade cards vertically anymore.
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