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 Bordeaux ‘Act for Change’ symposium Americans swindled in $13m wine investment scam Bordeaux 2021 en primeur campaign delivered ‘predictable chaos’ and ‘pitiful revenues’