This a gridfinity bin (3x1) for an SSD enclosure I got off Amazon - SSK HE-C326. The enclosure came with very short cables so I made the bin a bit taller to place the cables underneath the actual SSD enclosure.
In addition, I cut out some holes at the ends to make it easier to lift the SSD enclosure out of the bin and still have it stackable.
The author marked this model as their own original creation.