Did a little math and 400,000 cc boobs would equate to 105.669, or about 106 gallons, of mass. That's about 53 gallons per tit. Using a rain barrel as an example, the closes match is a 24" diameter wide by 28.5" tall barrel. evened out and each boob is 26.5"/66.675 cm in diameter and weigh 442.02lbs