The wallet-sized passport card is a great solution for that case then. It’s much cheaper than the regular passport book (and you are allowed to have both at once), doesn’t invalidate your regular passport book if it gets lost or stolen, and is also usable to go between the US and Canada by land or sea without having to bring the passport book with you. For people with a Global Entry or NEXUS card, that card also works for every case where the passport card does (and more).
Green card holders also have a convenient wallet size for their green card, and they’re legally required to carry it with them at all times while in the US anyway.
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The wallet-sized passport card is a great solution for that case then. It’s much cheaper than the regular passport book (and you are allowed to have both at once), doesn’t invalidate your regular passport book if it gets lost or stolen, and is also usable to go between the US and Canada by land or sea without having to bring the passport book with you. For people with a Global Entry or NEXUS card, that card also works for every case where the passport card does (and more).
Green card holders also have a convenient wallet size for their green card, and they’re legally required to carry it with them at all times while in the US anyway.