A lightweight thin camelback style pack or fanny pack would be ideal in a cruise ship situation. Keeping not only everyday items but important survival items and tools on your person at all times is best. All them lights are useless when your nowhere's near your room.
Lightweight, thin, and SIMPLE would be important features on a ship. It essentially becomes a close-quarters situation where errant straps, buckles, or dangling doohickies become dangerous because they can snag. That's the last thing you need when navigating narrow confines that can be dark, flooded, and potentially upside down.
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