Who says growlers have to be metal? Here's a ceramic cannonball growler that can hold 1/2 a gallon of beer. This is patterned after German Grolsch-style growlers that can hold the most amount of beer in the smallest container possible, thanks to the surface area to volume ratio.
This growler is 100% American made, made of strong, stoneware clay, and is opaque for optimal beer storage.