A portable toilet is a modern, portable, self-contained outhouse manufactured of molded plastic in a variety of colors and is often used as a temporary toilet for construction sites and large social gatherings. Portable toilets are referred to colloquially or sold under such brands as port-a-john, port-o-let, sani-privy, port-a-san, porta-potty, toi-toi, porta-kybo or portaloo. The word Portaloo is legally a trademark of Portakabin, Ltd., but has been generalized to refer to any make of portable toilet, at least within the UK and Ireland.
Portable toilets are large enough for a single occupant - usually about 90 cm (3 ft) on a side by 210 cm (7 ft). They are held upright by the weight of the disinfectant liquid in the holding tank at the bottom. Nearly all include both a seated toilet and a urinal. Most include lockable doors, ventilation near the top, and a stovepipe vent for the holding tank. Some newer models include toilet paper or, occasionally, antibacterial hand gel dispensers.
Though more expensive than a standard permanent outdoor latrine, portable toilets have several significant benefits mostly related to their portability. They are rented to customers by companies that guarantee their cleanliness, and so as a rule are drained, cleaned, disinfected and deodorized on a regular basis. As they are not plumbed, they do not clog or overflow. A single portable toilet can be hauled in the back of a pick-up truck.
They are frequently seen at outdoor work sites, particularly construction sites, and large banks of dozens of portable toilets allow for ready sanitation at large gatherings such as outdoor music festivals.