GSI Outdoors Escape 1 Person TablesetSince their invention, cups and bowls have been defined by their volume, their literal ability to hold water as it were. But this definition was also a prison when it came to space, as a 12 fl. oz. cup occupied at least 22 cu. in. of highly valuable pack space (plus a little more for materials). The bigger the cup, the bigger the bowl, the more space it occupied, so hungry, active adventurers were always forced to lug around bigger and bigger bags