It seems you could do the same thing with a plastic trash can, with lid, optional drain holes in the bottom, layer of straw (wood chips if you prefer) on the bottom and around the sides. Root vegetables in the center.
Top with a layer of straw, or wood chips, and the lid.
It has the added benefit of being easy to open and close, the clamp seems like you would need to dig out each time you retrieved potatoes.
