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We take a case of pop with us on board every cruise. There is no problem doing this. I know that pop is a lot cheaper here in Canada than in the US. Depending where you are departing from, it is often more convenient to purchase it in the US. That said, most of the cruise terminals do not have anywhere to buy pop. We fly down a day ahead and then find a store close to our hotel.
We have always packed two liters in the giant 2 gallon size zip lock bags (in case of a leak). They make the suitcase heavy, but we haven't ever had a problem with it before. Just curious for those of you who bring the cases of pop--do you carry them on or pack them?