Are plastic travel cups useful on RC?

Thinking of this as an idea for wedding favors-personalized travel mugs. Just not sure if as useful on a cruise as at an all-inclusive. We have 60 sailing guests and probably 35-40 will have drink packages.

Thanks for any advice!

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They can still use them for water, Lemonade and Iced tea as well as putting their purchased drinks into them to carry around.