Which packaging innovation was initially criticized for being wasteful, but revolutionized its industry by solving the 'last portion problem' that had frustrated consumers for decades?

Packaging design isn't just about aesthetics - sometimes it completely revolutionizes how we use everyday products. Throughout history, certain packaging innovations have solved persistent consumer problems, transformed industries, and created entirely new market categories. This trivia question focuses on one such groundbreaking packaging design that forever changed how we consume a popular product. Test your knowledge of product design history and see if you can identify this revolutionary packaging innovation!

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The squeeze tube for toothpaste (1892)
The upside-down ketchup bottle with silicon valve (2002)
The pop-top can for beverages (1963)
The resealable zipper closure for food bags (1954)