An insulating container liner comprising a first sectioned insulating panel piece comprising an insulating material and a thermoplastic shell enclosing the insulating material, wherein the first sectioned insulating paneling piece forms the bottom, a side and top of the insulating container liner; a second sectioned insulating panel piece comprising an insulating material, and a thermoplastic shell enclosing the insulating material, wherein the second sectioned insulating paneling piece forms the remaining three sides of the insulating container liner; and a flexible outer bag housing the first and second sectioned insulating panel pieces wherein the bag is attached to the first and second sectioned insulating panel pieces.