Welcome to the wonder full world of Kellogg's, one of my favorite pursuits. I can mirror what others have said mostly. If it is flat and raw, then top loaders are fine. If they. have minor curl, I keep them in top loaders made for thick cards which allow for some curl while protecting and preventing cracking. Like said before, if they are curled they will crack at some point if flattened. I I have multiple sets of all of the years either finished or still in progress on my second set. I have NM sets in pages in binders. Then I keep most of my second sets stacked in the plastic boxes. If all of the cards have the same curl and they stack neatly together, additional curl is mostly prevented. If you can avoid temperature extremes and humidity they can be safely kept and enjoyed. For stars apart from sets, I do the same things. Then there are the curled stars/extras. I have more than my share of badly curled football and baseball, but darned if I have any real desire to move them.
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