I'm going to try this. My cousin Rose posted a link on Facebook and I had to do a bit more research. This link from Mother Earth News describes how to go about it.
Mother Earth News
This would work especially well in back yards with no garden space or very poor soil. I would certainly be using an organic mix. In the fall, I would discard the bags and use the soil in my garden to improve it's quality. I have clay soil and it's heavy. I put an awful lot of soil amendments like horse manure every year. The result is beautiful soil.
Here's their photo from their website to entice you over there. They have a wonderful site!