This is a 5x2x3 Gridfinity bin for an 830 breadboard. 

I wasn't able to find a suitable one for me so I designed one which hold the breadboard snug and is also stackable. 

A 4x2 grid would probably work, but i thought having some small trays around it would be a nice feature.

You can also add 6x2mm Magnet in the Bottom and removing of the board is also really easy with the holes in the grid.

Gridfinity is licensed under CC-A-NC-SA.