Some tips I read from Johnny Jet about your vaccination card…
Instead of laminating it, put it in a resealable plastic badge holder from an old travel conference. You can always buy one if you’ve thrown your old ones away.
Another tip from a reader of his website says he is going to shrink his card to wallet size. Then he can carry it more easily. He also had several copies made, full size and shrunk. He can put those in with his travel documents.
By the way, he keeps his original in a safe place.