No, Princess Cruises (and most major lines in 2026) lists all knives—including pocket knives and multi-tools—as prohibited items, regardless of the blade length. While some lines previously allowed blades under 4 inches, the 2026 security standard has moved toward a "zero-tolerance" policy for potential weapons to streamline the AI-driven X-ray scanning process during embarkation. If a pocket knife is found in your luggage, it will be confiscated by ship security. In some cases, they may hold it for you until the end of the cruise, but often these items are discarded without compensation. If you need a cutting tool for a specific hobby (like diving or fishing) or for a shore excursion, you are expected to rent equipment or buy it locally at the port. Note that scissors with blunt ends and blades shorter than 4 inches are typically the only "sharp" personal items permitted in your stateroom for 2026 sailings.