Heavy-duty reusable grow bags are economical and easy to use. They are self-standing once filled with soil. They have pre-punched holes to allow for good water drainage and they come packed flat. The Quart bag is 3" x 3" x 7.5", 3 MIL.
I've bought these by the hundreds for several years and none has worn out yet. Cuff to start seeds, use full size for high-density veggies like spinach and for starting whole potatoes. Rinse in 10% Clorox before re-using to kill last season 's bacteria, viruses and mold. Collect 9-12 in
A dishpan to grow veggies in a window all Winter and to get an early start in Spring. To transplant, soak, squeeze gently and dump entire contents into your hand. At15¢ each, this is the best buy in gardening. Larger sizes are just as good for different purposes.