Midwest Gas Can FlameShield - Midwest Can containers are designed to be environmentally friendly and to meet or exceed the California Air Resources Board (CARB) and EPA requirements for portable fuel containers. Our cans are made of durable HDPE and feature vapor barrier technology built into the container walls. All Midwest Can fuel containers include exclusive FlameShield Safety System. This two-piece system provides consumers with a "double layer of protection" from accidental fires that can result when improperly handling and storing gasoline and other flammable liquids.