My version of the concept for holding bars of soap in your storage location of choice. I built mine around the size of a brand of bar that comes in a box. It will just as easily hold smaller bars too.

I also made it modular so that you can just keep stacking up the extension modules to your heart's content. ( Nine feet of soap? Go for it!)

I have also included the Fusion360 file so that you can adjust it as you see fit. I tried to label all the parts and the steps so that is easier to work out what each part is and how you can adjust it. **Fusion 360 is free for personal use.