For my current specific situation, I no longer use three gallon containers for cannabis at all. Indoors or outside.
And considering that yield is low on my list of priorities, I generally use 1 gallon or smaller for my reefer plants. The big drawback is that they require more watering/feeding, but I have the time. I prefer a variety of different flowers over yield per plant.
The small containers are very easy for me to move, I can carry 2 or 3 at a time.
This makes me realize that over the years that I have been growing, my technique has evolved to use smaller and smaller containers. I currently use ProMixā¦ maybe I should try coco and see if I can go even smallerā¦