Which innovative product packaging solution, introduced in the 1990s, revolutionized its industry by solving the "last drop problem" and is estimated to have saved consumers over $1 billion collectively?

Product packaging isn't just about protecting what's inside—it's about innovation that can revolutionize entire industries! Throughout history, certain packaging breakthroughs have transformed how products are stored, transported, and consumed. This trivia question focuses on a packaging innovation that fundamentally changed a major consumer goods category, creating billions in value and solving a persistent consumer pain point. Test your knowledge about this game-changing packaging development!

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Inverted ketchup bottle (Heinz Easy Squeeze)
Pop-top aluminum can (invented by Ermal Fraze)
Resealable cereal box liner (General Mills Fresh-Lock)
Child-proof medication bottle (Palm-N-Turn design)