Travel Lid for smallest Harbor Freight Storehouse

We have a lot of small parts in our Harbor Freight Storehouse bins. The smallest parts find their way OUT of the small storage cups when we travel. This lid is to fit into the storage cup AND still work with the lid on the storage cases... https://www.harborfreight.com/brands/storehouse/20-bin-medium-portable-parts-storage-case-93928.html or https://www.harborfreight.com/brands/storehouse/15-bin-portable-parts-storage-case-93929.html