Every card I have is first put in a penny sleeve. All baseball goes into Card Saver 1's and all football go in top loaders. Don't ask me why that is...
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I do like the ability to handle each indvidual card and putting them in sheets hinders that.
Plus, as I have mentioned before on here I find some of the cards "creep" up and leave the top exposed. And, since I am OCD on some things that just irks me to no end.