The Magnum Bottle and Other Oversized Wine Bottles Wine bottles are 750ml; that’s the norm. Why? Because for many centuries, that was the exact amount for an English gallon. Of course, some people say bottles are that size because they contain the precise amount of wine one can enjoy with friends during a meal. What do you think? Yes, wine bottles come in different shapes and sizes, and we’re talking about them today. If you want to learn more about the world of wine and its secrets, talk to a winemaker during a private winery tour to the Yarra Valley with Chauffeur Drive Melbourne, Yarra Valley. These are fantastic experiences and popular Melbourne tours that will show you the other side of wine — the winemaking side.