a collapsible insulated jacket for a beverage container is formed from the same material as that of the carton in which the beverages are sold . a plurality of insulated jackets are secured together along a perforated line . the plurality of insulated jackets can be formed as a portion of the carton or as a separate item removable secured to the carton . a layer of insulating material can be added to the material of the jacket to provide additional insulating properties for the jacket .