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.