And that rule of bigger pot = bigger plant is only true to the extent that your light can support a plant. If you put a seed in a 40L pot and grow it out huge unless your light is strong enough to support the plant in flower, you’ll have a bush full of larfy nothing buds.In soil the bigger the pot, the bigger the plant can grow, and the bigger the harvest you'll get. Many indoor soil growers use 25 - 40l (7-10gal) pots. Some go even larger.