This project is made for 1, 2 or 3 gallon black plastic nursery containers or the like. You need 2 containers. You simply cut out the sides of one container to make a flap system and insert it into a the other container. The video shows you the design, tells you how to plant the potatoes and gives you an example of how you can check on the potatoes growth. You can even harvest the potatoes with this system without dumping the contents. It simple and effective.