Which of the following was the original inspiration for Pringles' distinctive tubular packaging design?

Food packaging design is often as memorable as the product itself. Some designs become iconic, changing the way we interact with and consume products. Behind many food packaging innovations lie fascinating stories of problem-solving, creativity, and sometimes accidental discoveries. This trivia question explores one of the most recognizable packaging designs in the snack food industry and its unusual inspiration.

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Tennis ball canisters that efficiently stored balls without damage
A garbage can design that inventor Fredric Baur saw while taking out trash
Stacked potato chips in a saddle shape to fit neatly inside a cylindrical tube
WWII food ration containers that needed to be compact yet protective