The document describes a prototype boat made from a plastic bowl, balloon, aluminum foil, and paper cup. The balloon is taped inside the bowl and surrounded by aluminum foil to displace water and prevent water from entering the bowl. A paper cup attached to the center of the balloon via tape is used to hold weights. The materials and dimensions of each component are listed, and the rationale for choosing each part is explained. The boat was tested by adding pennies until it tipped over, and data on the maximum mass held over 10 trials is displayed in a table, along with notes on the boat's behavior during testing.