this last round was yogurt containers filled between 550-750ml full, solos will be this round for Mad's contest
But yes a couple of reasons.
Before i used the fabric pots specifically so i could bottom feed the plants and they would air prune, also had tall trays for them which limited evaporation. But the current setup more evaporation was happening through the walls of the pots than i would of liked, plus i wasn't bottom feeding anymore, so decided to go to a solid pot which is easier to deal with too.
And the center is actually root bound, just look closely, its just a dense mass of roots interwoven into the coco, its just on the outside the roots have no where to go so they start to stack on top of each other causing the white walls