Abstract: An insulated container for maintaining the initial temperature of its contents for prolonged periods of time. Insulation, comprised of a polyethelene outer skin lamination, an intermediate expanded foam lamination, and a fluid tight polyethelene outer skin lamination, is attached to the inner surface of a rectangular tank having an inlet opening in the top wall. A gasket simultaneously provides a seal between the tank and a cover, a fluid tight covering over the juncture between the insulation and the tank at the inlet opening, and a fluid tight covering over the open edge of the insulation at the inlet opening.