I have seen people buying these rail clip tool holders from Harbor Freight and attaching them to the rails on their Packout boxes with zip ties so I thought I would come up with a more secure and cleaner looking solution. This simply clamps around two of the Packout rails so you don't have to remove the rail or screw into it and allows you to screw the tool rail to these mounts. I used 6 M5 x 15 screws to attach everything together and it is a very solid connection.

I would recommend to print this in ABS, ASA or at the very least PETG. I printed mine in PLA plus only because it will not be outside very much if ever so if that is the case PLA or PLA plus would be fine for this.