Cost of aluminum and cost of shipping. I saw some numbers about the big boys like coke and pepsi, who have gone to ultrathin cans. The money they save on shipping is just incredible.
I was pushing a loaded two wheel handtruck around the distributors, and they had cases of pepsi 6-packs with the plastic wildlife traps, in low cardboard flats, stacked about 5 ft high along the aisle. The handtruck had cute little angle iron fenders welded above each wheel that I managed to slice through about 4 cases of cans before I noticed my ankles getting sprayed.
