Ohh thanks for chiming in! A lot of cool info in your comment, especially that last part about the bumps at the bottom of glass bottles.

I can only agree that aluminum is better than plastic, but I’m not sure about hexagonal cans. The cans we know nowadays are insanely well engineered and only use a minute amount of material, taking advantage of the pressure of carbonized drinks. I don’t think there’s any way to increase packing efficiency of Aluminium cans without increasing material thickness to an unreasonable degree. But regardless, if all drink containers were regulated to be Aluminium (or glass), it would certainly be a big improvement.