Storage structure for refrigerator appliance

A cover for a storage bin of a refrigerator, the cover comprising:

• a panel having an upper surface for storing food items thereon that is substantially planar and substantially horizontal, the panel separating an upper space located above the panel from a lower space located below the panel;
• and
• a communication portion that is configured to provide fluid communication between the upper space and lower space, the communication portion comprising:
• an upward-facing recessed surface,
• one or more side wall portions that extend above and at least partially bound the recessed surface, and
• a plurality of apertures that extend through the recessed surface and provide fluid communication between the upper space and lower space,
• wherein the recessed surface and the one or more side wall portions collectively define a recess, and wherein the cover further comprises an insert member that is removably inserted into the recess such that the insert member is flush with a top of the one or more side wall portions, and wherein the insert member comprises moisture-absorbing material,
• wherein the insert member further comprises a body defining an upper portion and a leg portion extending downwardly from the body, wherein the leg portion is configured to rest against the recessed surface to space the upper portion relative to the recessed surface to define a chamber therebetween, and wherein the upper portion defines a slot extending between an upper surface and a lower surface thereof adapted to enable fluid communication between the chamber and the upper space.