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In page Pepsi:

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During the Great Depression, Pepsi gained popularity following the introduction in 1934 of a 12-ounce (355 mL) bottle. Prior to that, Pepsi and Coca-Cola sold their drinks in 6.5-ounce (192 mL) servings for about $0.05 a bottle.[citation needed] With a radio advertising campaign featuring the popular jingle "Nickel, Nickel" – first recorded by the Tune Twisters in 1940 – Pepsi encouraged price-conscious consumers to double the volume their nickels could purchase.[1][2] The jingle is arranged in a way that loops, creating a never-ending tune: