I brewed a barleywine eight days ago. The 20lb. grain bill plus water nearly filled my 48qt cooler. I could have squeezed in some more, but I wouldn't have felt very confident in my ability to stir without some overflowage.
American Stout, Breakfast Stout clone, Rye IPA, Braggot, Roggenbier, Pale Ale, Oat Stout, Apfelwein, Pliny Clone