7UP's name origin has a couple of potential explanations rooted in its history. According to Britvic, the name "7UP" stemmed from two main factors:
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Bottle Size: The beverage was originally sold in 7-ounce bottles. This was a unique selling point because competing soft drinks, like Coca-Cola, came in 6-ounce bottles.
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"UP" Meaning: The "UP" in 7UP potentially refers to the phrase "bottoms up," another way of saying "Cheers!"