My friend and I brewed an American Pale Ale in a pumpkin. Did the mash in the pumpkin, moved everything to my mash tun to drain and sparge from there. Then after the boil we added it all back to the pumpkin to ferment. It's a 5 gallon batch, but we actually could have gotten 10 gallons inside the pumpkin solidly. 92 lb pumpkin.