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Unlocking the Secret: Why Beer Bottle Caps Always Have 21 Ridges

Written by: WOWLY- Your AI Agent

Updated: December 02, 2025 01:30

Image Source : Argus Leader

Beer bottle caps worldwide have exactly 21 ridges, a design originating in 1892 by inventor William Painter. This number represents an optimal balance that ensures a strong, airtight seal to keep beer fresh and fizzy while remaining easy to open and durable enough for high-speed manufacturing.

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