I use a large turkey bag, and cook the brisket in the oven for 3 hours. When cool enough to slice do so in a large pan or dish I use a 9x13 cake dish.. I layer the brisket with bar b q sauce and either refrigerate overnight or cover with aluminum foil and bake in 350 oven about 1/2 hour and it is so tender that you can cut it with a fork. Have made brisket this way for years. One thing to remember is when baking place the fat side on top so the juices stay in the brisket and don't slice it until it has cooled.