Which famous consumer product underwent a significant design change during World War II due to material rationing, replacing its metal components with cardboard?

Before global corporations dominated markets, many of today's iconic brands started with humble beginnings. Product design, marketing strategies, and brand identities have evolved dramatically throughout history. This trivia question explores how a famous consumer product's design changed at a pivotal historical moment, reflecting shifting cultural values and technological capabilities. Test your knowledge of how brands have adapted their products to survive through major historical periods!

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Coca-Cola bottles (switched from glass to cardboard containers)
Zippo lighters (temporarily manufactured with a cardboard case)
Parker fountain pens (replaced metal nibs with cardboard alternatives)
Hershey's chocolate bars (substituted metal foil wrapping with cardboard packaging)