A gallon is the basic commercial unit of measurement for beer.
There is a lovely walk, heading both north and south from the carpark at Firkin Point. And the name 'firkin' just kinda begged for a series of caches. There are a variety of sizes of container, including a couple of larger ones, some smaller and some even smaller. The discerning 'cacher will no doubt consider adding GCTP26 to their itenerary alongside this series, seeing as it sits nicely in the middle!