First find a suitable container. In this case I'll use a 55 gallon drum that I'm replacing as a rain barrel. Its the wrong color that lets to much light thru so algae grows in it.
This one also has molded ribs that will allow stacking after cutting. That way as you add dirt they will stay together better.
Drainage is important so drill a few holes in the bottom.
Now cover the holes with 1/4 hardware cloth to hold in the dirt.
Add dirt and ready to plant.
One has red pontiac and one has kennebec's. As the potato's grow I'll add the other rings, more dirt until its all full. Once the vines die off I can harvest a ring at a time, keeping the rest in the ground until needed.