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alright PSA rant here. my dumbass had some <10$ cards stored in a few binders. one was hard-cover ring with detachable pages. the other was an ultra-pro premium soft cover with stitched pages and side-load pockets. I had both laying on their side. guess what happened? the stitch page warped my cards cause it has a natural bend, and when you store the binder on its side the cards get pressed down into it. so moral of the story guys, if you have stitch page binders store them vertically, although I havent tested that out yet, maybe I should just not use stitch page altogether I think I'm sticking to cheap ring binders from now on they keep the cards flat which is the most important feature.
picture related, although I didn't use the straps (cause I was worried bout bending haha, little did I know it wouldn't matter!) I did have it on the side like this (without any other binders, literally just the weight of itself bent the cards).