Portable toilet - China has a huge population, when a disaster occured, it will inevitably impede the traffic system and trap a lot of people, go toilet will become a tough problem. Place early in 2008 in Hunan, China, an ice disaster, roads impassable, the railway power supply system is damaged, los of people trapped on the road, they only can do their need on the roadside the road just stinked to high heaven that make all the passager very uncomfortable. This design try to solve it.