Abstract: A liner for insulating a beverage within a frozen drink container. The liner is preferably generally shaped and sized to conform to the shape and size of the drink container. Once the liner is inserted within the container, and a beverage is poured into the container, the beverage is contained and insulated by the liner. The container is preferably made of a break-resistant plastic resin. A removable top may be provided for the lined container, which may provide an air-tight and peelable seal for a ready-to-drink beverage contained there.