These freshness balls are ideal against unpleasant onion odours in the refrigerator. A firm screw cap not only keeps the contents fresh longer but also prevents unpleasant odours from developing. Garlic, lemons, herbs and other foods can also be stored in the 2 onion tins. In the refrigerator, you can store the storage balls in a stack thanks to the flattened bottom. The plastic onion boxes come in 2 sizes and are dishwasher safe.