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Coffee and tea are abundantly available on board, but cruise cups are notoriously small, so you'll need a few refills for a proper morning jolt. If coffee's not your thing, the mug comes in handy for preventing spills in busy buffet lines. Poolside, the insulation keeps drinks frosty.
Save luggage space by stuffing your mug with small items, scarves, ties, or a teeny bikini.
No travel mug? Thrift shops carry tons, and at less than a dollar, they're cheaper than $10-15 on the boat.
[Photo: Flickr | poohjay]