Which 1960s packaging innovation was initially rejected by consumers as 'unnecessary' but later became standard practice after extensive marketing campaigns highlighting its convenience?

Throughout history, product packaging has evolved dramatically, influencing consumer behavior and brand recognition. In the 20th century, one particular packaging innovation revolutionized an entire industry and changed how consumers interacted with everyday products. This innovation not only solved a practical problem but created an entirely new marketing approach that companies still utilize today. Test your knowledge of this pivotal moment in product design history!

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The pop-top aluminum can (pull-tab) for beverages
Plastic milk jugs replacing glass bottles
Aerosol spray cans for household products
Resealable zipper bags for food storage