It fits all sizes of growlers and I plan on making some inserts to accommodate some smaller growlers. It is made out of 1/2'' MDF and 1/4'' plywood. It is glued and screwed to hold together. It does have a downside. When full it is heavy. Six full growlers is about 3 gallons, which is about 25 lbs, just in beer weight, not counting the glass and wood. It does the job, though and can handle all the weight.
Bootlegger's Brewery, Fullerton, CA - Chocolate Mint Porter (I wish I had more to put over ice cream!)
Stone Brewing Co, Escondido, CA - Levitation, One of my all-time favorites from Stone)
Stone Brewing Co - IPA, another fantastic favorite
El Segundo Brewing Co, El Segundo, CA - Citra Pale Ale, the Citra version of their house Pale Ale
Eagle Rock Brewery, Los Angeles, CA - Solidarity, their English Mild and at 3.8%
you can drink it all night
Monkish Brewing Co, Torrance, CA - Anomaly, a dark Belgian Strong
that is probably my favorite from them