瓶を握るためじゃね？
https://images.fineartamerica.com/images-medium-large-5/vintage-coca-cola-ad-nomad-art-and-design.jpg
https://cdn1.considerable.com/wp-content/uploads/2019/03/12110721/7-coke-c-1930.jpg
https://prtimes.jp/i/1735/288/resize/d1735-288-488232-0.jpg
https://prtimes.jp/i/1735/209/origin/d1735-209-646025-0.jpg