When harvesting potatoes and sweet potatoes from the ground or from a raised bed, you have to dig them out. With this method, you risk bruising the skin which isn’t good for storing. If you grow them in a grow bag, you can just dump the dirt and harvest the potatoes.
While you can buy some grow bags already made up from Gardeners or another website, I started making my own a few years ago. First of all, I used premium landscaping fabric that was good for more than one year. I cut two 19″ circles and two rectangles that were 25″ tall x 59″ wide for each grow bag so it would be double thick. I sewed the sides that were 25″ together and then sewed the tube to the circles.
At this point, I have a total of 12 grow bags. I use six for potatoes and six for sweet potatoes. They can be also be used for different purposes in order to rotate your crops.