Which groundbreaking packaging innovation of the 1960s revolutionized the soft drink industry by making the product more portable and helping establish a new consumer habit?

Throughout history, packaging innovations have dramatically changed how products reach consumers and sometimes revolutionized entire industries. From food preservation to marketing psychology, clever packaging has shaped consumer behavior and brand loyalty for centuries. This trivia question explores a pivotal packaging innovation that transformed an industry and consumer habits forever.

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The pull-tab aluminum can (invented by Ermal Fraze in 1959, widely adopted in the 1960s)
The Tetra Pak carton (which was primarily used for milk and juice products)
The plastic screw-top bottle (which didn't become mainstream for soft drinks until the 1970s)
The six-pack plastic ring holder (which was an important but secondary innovation)