What's the difference between a passport holder, a travel wallet, and a neck wallet?

A passport holder is a slim cover that protects and lightly organizes one passport plus a card or two. A travel wallet is larger and holds passports, boarding passes, cash, cards, and sometimes a pen. A neck wallet, like the Hero pick here, is a concealable pouch worn under clothing for anti-theft security while traveling. Choose based on how much you carry and how much you prioritize concealment versus everyday access.