Home Learn Double magnum Decanter Staff November 11, 2010 Bottle of 3 litres equivalent to 4 normal (75cl) bottles. In Champagne this size is called jeroboam. Written by Latest Wine News Editors’ picks: Bonus tips on wines to watch – December 2025 Is America’s political instability hurting the wine industry? Six Swiss Syrah to convert the most die-hard Rhône lover DWWA winners tasting in the heart of South Korea Historic Santorini vineyards struggle against climate change and tourism