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 Pursehouse: Cool climate is the future of wine Penderyn launches first whisky from its North Wales distillery Katherine Cole: When wine met tariffs, history rarely went according to plan London wine heist: Tuk-tuk driver steals bottles worth £24,000 Growth of English and Welsh still wine sales outpaces sparkling