This invention relates to a unique food preservation system that is used to extend the shelf life of food items by automatically modulating the gas composition within an air-tight container to the optimal atmospheric conditions for the specific food item(s) being stored in these containers. In order to extend the shelf life of food items, the optimal levels of carbon dioxide and oxygen must be maintained within the food storage container at all times. This is accomplished by constant real-time monitoring of the atmosphere within the food storage container and actively as well as passively controlling the atmosphere.