15.5 is a number that is as significant to beer drinkers as 13.1 and 26.2 are to runners. There just so happens to be 15.5 gallons of beer in a keg, we look at this as our own marathon. These decals have been designed for those of us who may not be athletic enough to tackle a 10k, but do like the sound of a cold, hand crafted, organic beer.