Which packaging innovation, first introduced in the 1960s, revolutionized beverage retail by allowing consumers to easily transport multiple drinks while dramatically changing store displays and purchasing patterns?

The evolution of product packaging has dramatically influenced consumer behavior and retail strategy over decades. Some packaging innovations were so revolutionary they fundamentally changed how we shop, store, and consume products. This trivia question focuses on a groundbreaking packaging innovation that transformed both consumer convenience and retail merchandising - creating entirely new product categories and shopping behaviors in the process.

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The plastic six-pack ring holder
The aluminum pop-top can
The Tetra Pak aseptic carton
The PET plastic bottle