Some would argue that a growler full of delicious suds is just as precious as a newborn. If this sounds like your position on home-brew, then you need the Growler on Board ($30) Beer Transfer Unit (BTU). Forget about laying your growlers on the back seat (or even worse, your trunk!), this BTU holds standard 1/2 gallon growlers, as well as 2L swing top style growlers with handles. Made from low density foam, your growlers will enjoy the smoothest clink-free ride they have ever experienced.