I have to believe this is old news but I found that a tuna fish can (which I opened with a safety side cutting thing) makes an excellent cap for the Heineken 24 oz. can. It fits real snug. I thought it might be good for carrying things in your pack that could use a little extra protection. I also turn the cap upside down and push the open end into the ground a little as a nice little base for the cat stove I have been messing around with.