I am learning how to garden and realize that the tomato plant I am growing is like a vine. Some have suggested that I make a cage to go around them (I have them in 20 gallon fabric containers). Someone also recommended to not buy the ones already made at the store. I wonder what the disadvantage would be by using one of the tomato cages they sell in the store. Does anyone here use tomato cages for their tomatoes? What are the alternatives? Thanks.