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 Luxury Napa wine country home hits market at $25m After the fires: Four iconic Napa wineries share their recovery stories The Top 50 wines of 2023: Decanter World Wine Award’s ‘Best of the Best’