Surprisingly no, google claims cans have been getting lighter but 15 grams empty is realistic, lets assume water at a gram per mL, 12 oz water is about 350 grams, that is about 5%, I don&#x27;t remember the exact specific gravity of aluminum but its less than 3 (not a very dense metal...) so 5&#x2F;3% by volume, roughly?  This is all engineering estimates done in my head so exact numbers will be different but its not going to be orders of magnitude off.<p>A significant source of error beyond 1 sig fig is going to be the weight of ink&#x2F;paint and the weight of the pop tab on the top.  Also cans are not filled 100% with liquid, so there is air space (it has 12 ounces of liquid, but its a 12.something volume tank)<p>Something interesting to think about is fluid dynamics, a foam like this would stop sloshing at almost no weight penalty.  If you like the idea of tin foil thickness gas and water tanks, then this would seem to be a requirement for that technology.