In my experience auto's and small container's do not mix well.
Milk cartons should give you decent results, especially if you mix some coco in.
Tall containers work best imho, auto's tap root loves to go very deep.
Good luck
=K
It is true that bigger pots will give you bigger plants but if the conditions are not suitable for large pots then better to use taller than wider pots.Bigger Pot Bigger Plant....it's that easy
I think this comment is to broad because from what I found is the above is true for normal plastic pots and grow bags but when you use smartpots or airpots ( I think they are called airpots. ) it is not correct.
With the containers being plastic the roots grow down and begin to circle the bottom and they get root bound sooner. But with using Smartpots and Airpots the roots do not circle like in plastic so that in turn gives the roots more room and grows a bigger plant. Also being that they dry out faster I can feed more because I water more.
Here is a G13 x Hashplant x Lowryder in a 2 gallon smart pot and in this picture just barely started to flower at 40 days from seed.
S_a_H
It is true that bigger pots will give you bigger plants but if the conditions are not suitable for large pots then better to use taller than wider pots.