That is one fantastic device.  I love it!  After everyone's suggestions - here is what I ended up doing and it worked great.  My son seamsealer and myself went to the heart of Quetico this summer and I got three alumium foil cake pans (throw away type) and took them along.  I bought a bunch of cake mixes and corn bread mixes from Cub Food and away we went.  I got the a lot of hot coals, set one foil tin on the ground, put some 1 inch diameter rocks in the bottom, set the other pan inside that one.  I mixed the cornbread mix and poured it in the pan.  Then I put the third pan on top - turned upside down of course .  and then roled the edges all together.  I place the contraption in the coals, and scooped coals on top - enlcosing the whole thing.  Let it bake, pulled it out, and we had great corn bread, mixed up some powdered Jimmy Dean gravy, and WHAT A MEAL.  This whole rig weight a couple of ounces, and we used it 2 or 3 times before we stopped and trucked it out with us as scrap.  Worked great.  Thanks to everyone for the ideas that culminated in this rig.