I'm an indoor mj grower but do my veggies outside. Trying to do some planning now. Getting ready to germ up my various tomato and pepper seeds. For years I've had my veggie garden straight in the ground. This year I want to go above ground. Questions for you outdoor peeps. What is the optimal size for outdoor grow bags? 5, 7, 10, 20 gallon? I'm a prime member so free shipping. Amazon has several different options. Anything to stay away from?