Which now-common product packaging innovation was first widely adopted during World War II as a response to material shortages?

Product packaging has evolved dramatically throughout history, often driven by necessity during major global events. During World War II, one packaging innovation forever changed how consumers interacted with everyday products, creating convenience while addressing wartime material shortages. This innovation eventually became standard practice across countless consumer goods categories and remains prevalent today. Test your knowledge of this pivotal moment in packaging history!

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Aerosol spray cans
Plastic squeeze bottles
Frozen concentrate in cardboard tubes
Aluminum pull-tab cans