Weapons like firearms are banned, and even items that look like them, such as gun-shaped novelty lighters, are often prohibited. Guests should also avoid packing sharp objects like knives and scissors, with some exceptions. Personal grooming items such as safety razors are permitted.

Bringing illegal substances onto a cruise ship is a serious offense that can lead to immediate disembarkation and arrest. In 2026, all major cruise lines (like Carnival, Royal Caribbean, and Disney) have a zero-tolerance policy for marijuana and CBD products, even if you have a medical prescription or are departing from a state where it is legal. Because ships follow federal and international maritime law, these items remain prohibited. Other illegal items include unauthorized firearms, explosives, and ammunition. Beyond strictly "illegal" contraband, cruise lines also ban "dangerous" items like extension cords (due to fire risk), large knives (blades over 4 inches), and heating elements like coffee makers or hot plates. For 2026 cruisers, a major "pro-tip" is that security now utilizes specialized K-9 units and advanced X-ray technology during boarding; being caught with prohibited substances will not only ruin your vacation but could result in a permanent ban from the cruise line and legal prosecution in the port of arrival.