A container assembly includes a lid, a gasket connected with the lid, and a container body. The gasket includes an outer peripheral edge. The container body may include an inner surface, an upper opening defined by a peripheral top edge, and at least one discontinuity where the inner surface or the peripheral top edge deviates in shape from the outer peripheral edge of the gasket. The container assembly may also include an inner container where the gasket includes an inner edge spaced inwardly from the outer peripheral edge. The inner container includes a top opening defined by a peripheral upper edge, and is receivable in the container body. The outer peripheral edge of the gasket seals against an inner surface of the container body and the inner edge of the gasket seals against an internal surface or the peripheral upper edge of the inner container.