I used a stamp to imprint the shape of the breadboards to a solid gridfinity 1x5 container. There was just enough space to fit three breadboards side by side. There are cutouts as well so the boards can be inserted in each orientation. The board height for each one is different to support easy access.

Generally designed for these boards: [https://eu.mouser.com/ProductDetail/854-BB830](https://eu.mouser.com/ProductDetail/854-BB830)

Others might fit as well, check dimension before print.