Some toilet-cubicles are mobile and can be put in place where and when they are needed. These toilets are called Portable toilets. Portable toilets are commonly used at large outdoor events like concerts, festivals or carnivals. Portable toilets, being temporary, are also durable and convenient. Most portable toilets have black open-front U-shaped toilet seats with a cover. Portable toilets are often constructed out of lightweight molded plastic. Portable toilets are large enough for a single occupant. New portable toilets include toilet paper and hand sanitiser dispensers. Portable toilets are cheap as far as cleanliness issues are concerned for the simple reason that because they are not plumbed, they do not clog.