My first run of Autos were in 1.5 Imp Gallon pots, which is nearly 2 US Gallons. They are doing very well, nearly finished. My second run is being done side by side with a third run. One lot are in 2.2 Imp Gallons fabric pots, so 2.6 US Gallons. The others are in the same 1.5 Imp Gallon pots as before. These second and third runs are all the same strain, Critical Blue by Expert Seeds, germinated a week apart. So we will see what difference it makes.