Soda cans also have a counterintuitive efficiency feature: concave bottoms. If a can with a flat bottom held the same amount of soda, it would be shorter and have less surface area, but its metal body would need to be thicker to withstand the same pressure. In the end, it'd require more aluminum.
https://www.csmonitor.com/Science/Science-Notebook/2015/0414...
^Probably not the best article for this, but it was easy to find and has a link to a chemical engineer's video.