The bottle is your regular standard 12 oz.er as far as size goes. The label is kinda fun. It has a little cartoon of two crazy brothers in barrells, with silly hats, big teeth, and mugs of root beer. How cheery.
Right on the bottle it says "creamy vanilla", which kinda spoils the surprise of it. But outside of that, there's not much to say about this one. It's good. Nothing wrong with it for sure. But nothing to set it apart from others. The fact that it has a nice vanilla flavor to it may or may not appeal to some people. I for one found it enjoyable. But regardless, it's still a good, stand alone root beer.
My official review is that Barrel Brothers gets 6 (six) IBCs. I was initially going to give this a 5 because it's kinda middle of the road, but thinking about it i think it's better than a 5. It's good and i enjoyed it. So no complaints here.