A lot of people collect collectable cards (e.g. baseball cards, footy cards etc.) in those special collectable card folder sleeves that are designed to protect and preserve collectable cards and display them in ring-bind folders. I do it with all my TF cards and collectable-card-sized tech spec cards (I wish the BotCon exclusive toys' tech spec cards were that size

). You can also get individual card sleeves to put on the card and then insert it into the protective folder sleeve for double-protection (you can put the sleeve on 'upside down' so that when you insert it into the folder sleeve, it's virtually airtight).
I actually have a set of Beast Wars cards completely sealed... but that's a spare set. I got two sets; one set which I've kept sealed, and the other is housed in sleeves in a ring bind folder. And tbh, I get far more enjoyment out of opened display cards than the loose ones. Having one set sealed is purely a novelty... but I don't get any direct enjoyment from the cards themselves, since I can't even see or touch them. Could be a small weight inside the box for all I know.
