This type of keg contains the equivalent of 165 12 fluid ounces cans of beer. It's about half as big as a Bathtub. In other words, 2,560 fluid ounces is 0.47 times the size of a Bathtub, and the size of a Bathtub is 2.1 times that amount. The capacity of a typical bathtub is 5,400 fluid ounces.