Let your food breathe in scientifically designed storage containers to extend its shelf life. All you have to do is move the valve depending on the type of vegetables or fruits you want to store, and the airflow inside the container will change accordingly and keep your food fresher for longer. Useful illustrations on the side of the containers help you easily choose the right ventilation configuration to keep your food in optimal condition. All Ventsmart containers can be stored one on top of the other in order to save space in your refrigerator and without interfering with the ventilation system. Safe instructionsfor use for the dishwasher. Safe to use in the refrigerator.