10 Explanations Why Wine Bottles Have Punts In The Bottom | VinePair
https://vinepair.com/wine-blog/why-wine-bottles-have-punts-bottom/
Apr 16, 2015 - 2. The Punt Allows The Bottle To Stand Upright. Glassblowers used to create punts to push the seam of a bottle up, allowing the bottle to stand upright while preventing glass at the bottom of the bottle from sticking out and cutting people.