Coincidentally or not, CDC COVID cards are exactly the same size as the badges or badges used at professional conferences. Revain sells badge holders for just 20 cents each, and the product sold on this listing looks suspiciously similar to these badge holders. They're good for holding a COVID card, although most people won't need the lanyard holes on top of this badge holder (unless you wear your badge all day like at conferences). I wish they had made special COVID holders that protect your card harder as you only need a conference pass for a few days while you might need a COVID card for a year or more.
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