So my 30 litre Home made air-pot actually worked out very well. So if you dont want to spend a whole lot of money get your drill out and drill small holes from the inside out and there you have it.
See how the roots are air pruned all along the side of the soil, their are not any roots bound.
At the bottom of the pot we can see the roots of the autoflower made it all the way and were root bound due to no air pruning.
Some pictures of the soil left from the Auto Ultimate, to show you it really works.
Some bud before the trim session last night: