This is your personal cup holder – never again do you grab the wrong bottle, like the one your seasick buddy just had his gross lips all over. It doesnt get any simpler than this – a single cup insert held to a surface by a powerful-yet-simple-to-use SeaSucker 4.5 vacuum mount. The cup holder insert removes for easy cleaning and can be swapped out for one of our Small Dry Boxes,which effectively turns this into a convenient holder for your cell phone and other items you dont want to get wet.