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 World wine consumption falls to 27-year low as inflation hits wallets Christie’s to auction ‘last treasures’ of Avery family wine cellar Rathfinny Wine Estate releases UK’s first 50cl sparkling wine