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[–] 6 points 1 year ago

Not sure whether it's true, exactly, but from my experience with tilting my glasses, they don't roll across a surface; they do rotate, or rock, but don't spill unless overfilled.

I never took mine on a sailboat, nor did I take any others, so I can't compare. However, I can say round bottomed cups are harder to spill than regular ones.

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