A package in accordance with the present disclosure includes a lid adapted to mate with the brim of a container to close an opening into an interior product-storage region formed in the container. In illustrative embodiments, the package is configured to store food that has been placed in the interior product-storage region formed in the container in a variable-volume interior chamber bounded by the container and lid when the lid is mounted on the container brim. The package is retortable and portions are elastic to cause an increase in the volume of the variable-volume interior chamber during exposure of the retortable package to high temperatures in an oven for several minutes.