you can buy the proper sacks at wmart or you use to. i tried it one year. strawberries i think. hung it on my fence. didn't bother afterward. the one thing i do with bags of soil though is lay them down all along the back of the house under the eaves. cut a strip out of the middle and plant. this is good for me in the city to get more planting space.
if all goes well this year i plan a couple raised beds in the lawn. i also have pots on the deck for tomatoes, herbs, whatnot. ~Georgia