Anthracite storage container with onion print. Grandma already knew it: onions are best stored in a dark and well-ventilated place. This protects the contents from external influences such as dust, moisture, and other environmental factors, keeping them fresh for longer. Additionally, using a storage container saves space, as they take up less room than individual packages. With this authentic storage container, onions can be stored in the kitchen in an ideal germ-free manner. Side ventilation openings.