A container cap for a container having a neck defining an opening into the container. The container cap comprises a lid including a top surface and a wall extending downward from the top surface. The lid is configured to engage the neck of the container and cover the opening. The lid is composed of a rigid material. A resilient gasket is integrally formed with the lid. The cap may have a wall including a threaded portion and an unthreaded portion with the gasket residing between the threaded and unthreaded portion.