[cricky101]

When I made my first one I used a gallon-size zip top bag. I added the meat and pressed it flat to fill it uniformly and tossed it in the fridge for a bit to chill while I cooked and cooled the filling.

Then I just cut down both sides of the bag and spread the plastic flaps open. I used it to help roll everything together, too -- Kinda like a big, clear, sushi mat.