D'Vines is selling both 32- and 64-ounce growlers, which are 2 2/3 and 5/13 beers, respectively. They started off pouring from a selection of 17 different craft beers, some local (DC Brau, Dogfish Head) and some from farther afield (Sierra Nevada, Hofbrau and Bitburget hefeweizens.) I hear they'll have various numbers of beers available at different times, anywhere up to 30-something. Once they're filled they're sealed so you can't drink them immediately (or at least not until taking off the seal.)
If you recall, D'Vines tried to do this in 2011, but it turns out it was illegal. Since then, the city (smartly) changed the laws, and that means more beer fans can get more beer.
Nice to hear this, though maybe not if you're trying to fight your beer belly.
UPDATE: A commenter just left this note on the hours: "Heads up, you can only fill them from 5 to 8 pm on weekdays and all day on the weekends....for now at least. Couldn't get my day drinking on today :( "