Vault toilets are revolutionized outhouses. It is a more comfortable and much nicer version of a pit. It makes no use of water and still basically has a hole with a seat over it. These vault toilets are commonly seen in parks and in areas where there is limited access to water. The waste is stored in the tank directly underneath the hole. It can store up to a thousand gallons of human waste before it needs emptying. They have invented ways to keep it from stinking such as specially designed roof or a vent to keep the air flow moving.