Mason glass jars are ideal for food storage because they come with lids and rings that make them airtight during canning. Mason jar lids are constructed with a rubber gasket that fits perfectly over the rim of the jar and is held in place with the ring.
However, it is crucial to follow the proper process of Canning. If you are canning at home, ensure that the lid is in place and pressed down. Make sure there is no leakage.