The Cans Were Made For Soldiers
The only thing more universal then Coca-Cola bottles are the aluminum pull-top tin cans. The idea to make the cans came out of necessity. Basically, the company needed a way to ship the product to armed forces overseas, and the cans were the perfect solution. The notion was practical, and it worked for a while. However, there was a slight issue during World War II.
During the conflict, materials need to make the cans were in low and limited supply. Unfortunately, the company was unable to produce them for the troops until the war ended. Because of how easily distributed and convenient the cans were, in 1960, Coca-Cola started selling them to civilian customers as well.