Porta-potties are typically miserable experiences, being dark, dirty and smelly. German mobile sanitary unit manufacturer Toi Toi & Dixi seeks to rectify this with the design of their Toi Water Up unit.
This is a companion discussion topic for the original entry at https://www.core77.com//posts/116878/Small-but-Welcome-Design-Improvements-to-the-Porta-Potty