a passport holder (or passport case or passport wallet, whichever you prefer to call it) will protect and preserve your most important travel document from drops, rips, spills and being stuffed in your suitcase. And not only is it nice to have a crisp and clean passport while on the road, years later, when your passport is expired, it’s also nice to have a crisp and clean passport as a keepsake (as opposed to one that’s stained and falling apart at the seams).