Method for making an insulated container having a shock-resistant bottom

A plastic-like container liner having spaced apart ridges at the bottom of said liner has a non-adhering material positioned on the upper inner surface of each ridge. A lower container body is positioned into a female foaming fixture and an expanding exothermic foam is injected onto the inside bottom surface of the lower container body. A male foaming fixture having spaced apart recesses conforming to the ridges of the liner intimately receives the liner and urges the peripheral flat portion of the liner toward the bottom surface of the lower container body. The foam expands exothermally such that heat released by the foam causes the non-adhering material to flow. The expanding foam is bonded to the lower container body and to the portion of the liner not in contact with the non-adhering material. Resultingly, an integral insulated container is formed having projecting ridges on the bottom surface thereof which assist in resisting the shock of items dropped into the container.