The Seattle Sports PVC Free Solar Shower, 4 Gallons, Black offers an excellent warm shower and peace of mind. The 4 gallons are enough for a couple of showers but heat up faster in the sun than the big 5 gallons and you get everything you do with the regular shower. Only this one is built from environmentally friendly materials that create nothing but CO2 and H2O when burned. The materials and chlorine and azo-free and did not cause dioxin, heavy metal or phthalate pollution during the production process. They release no chlorine-based chemicals throughout their lifespan. So you can happily bring this shower to any camping adventure safe in the knowledge that no harm is done to the environment.