It's not the smallest, but i carry my swedish army trangia in my day sack all the time. Inside it i can fit a couple of folding mugs, one of the fuel bottles that came with it, sachets of coffee and the polish mini 1 cup knorr soups and a small bottle of oil so we can fry up any shrooms we find.
Not bad for something 6" by 4". And i can always use it on an open fire if i run out of fuel.