The general rule in 2026 is to leave your original passport in your ship's cabin safe and carry a high-quality color photocopy or a digital photo on your phone. Most cruise lines and tour operators only require your "Cruise ID Card" and a government-issued photo ID (like a driver's license) for re-entry to the ship. However, there are critical exceptions: if your excursion crosses an international border (e.g., a bus tour from Italy into Switzerland), or if you are visiting specific countries like Cambodia or Vietnam that require physical passports for land-based checkpoints. Some travelers prefer to carry their original passport "just in case" they miss the ship and need to fly out of the next port; while this is a valid concern, the risk of theft or losing the document during a beach or hiking excursion is statistically much higher. Many 2026 travelers use a waterproof "passport neck pouch" or a hidden money belt if they must carry the original.