Sorry for being so slow on reply. The 12 oz. is for the chimney consisting of, one bottom tapered 2.5"x 20" section of steel or lighter titanium and one upper tapered 2.5"x20" section aluminum. An aluminum top carrier, bottom base and tapered sleeve to join the pipes together.
The steel 5"x5" stove would be 12 oz. which would be close to the weight of a gas stove with fuel.
The stove/chimney could be used to cook and eat inside under any tarp.
There are pictures on my other posts.