Our natural soap is derived from making biofuel. Marshall picks up used vegetable oil from some of the nation’s finest restaurants and then processes it in our warehouse. The biofuel goes into our cars and the glycerin goes into our glycerin soap. Then we take our natural soap back to the restaurants that provided the oil and voila - a perfect, sustainable circle. Each gallon of soap will include 1 empty 16oz Further Soap Bottle, as well as 1 pumps to make transferring the soap from jug to bottle much easier. We hope you enjoy using our fresh smelling sustainable glycerin soap as much as we like making it.