Hey Luke. I use 2 mil mylar in a top loader. Mylar is way cleaerer than poly (penny sleeves). Mylar is also available in thicker 4 mil sleeves that are meant to be used alone. I prefer the rigidity of top loaders myself, and nowhere does it say you HAVE to use a sleeve with them. I've dinged just as many corners putting cards into sleeves as I have top loaders.
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