Funny you should mention Spam cans. I have constructed several cook kits with these cans. They are the right size to fit in a pocket, are very durable and when fitted with a handle make an excellent container for heating water. Though awkward to describe, my Spam can kit has one can emptied and thoroughly cleaned with a small hole drilled at one edge which accepts a threaded screw that is glued into the drilled out end of a four inch wooden dowel. This turns the Spam can into a small pot with a handle. Another Spam can has both the top and bottom removed and a vertical cut made along the seam. This pops open to provide a wind break for the esbit or trioxane that will heat the "pot". A few holes drilled into the windbreak aid combustion. A few more holes drilled at the top edge of the windbreak allow insertion of two small steel rods that serve as supports for the pot. For storage, I wrap the windbreak can around the pot, unscrew the handle and drop it into the pot with the two small rods, slip it into a plastic bag and put it in my pocket or day pack.The can also holds several heat tabs, a lighter and tea bags/instant coffee. I apologize for hijacking the thread, but I have had a lot of fun with Spam cans over the winter. It was a long winter...