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Planning a cruise can be exciting, but it’s crucial to know what you can and cannot bring on board. According to Royal Caribbean's official prohibited items policy, here is what you absolutely cannot bring on board: What Not to Pack for Your Cruise ⚡ Power Strips, Extension Cords, & Multi-Plugs This is the number one thing that catches cruisers off guard. To prevent electrical fire hazards, Royal Caribbean bans all extension cords, power strips, and multi-plug outlet blocks.