Maybe I am missing something here. Maybe not. I was under the impression that tree pots, 3x8 or 4x9, held two purposes. 1 being to root them to up pot to a 4,5, or 7 gallon more permanent pot. Or 2 for shipping. I agree that moving pop to a tree pot seems a waste and only leads to yet another up pot if you are keeping them for yourself. I have been moving my pops to tree pots knowing they barely fit and only have a little more space. But of the ones I have moved, I plan to give away, or maybe sell. Tree pots are relatively cheap so it makes sense to move a pop to a tree pot if you need to move it via shipping or local sell. But I agree with several others comments. If you are keeping the cutting, why waste soil, time, and risk of transplant shock to move a pop to anything other than a 4+ gallon pot. This is my first year truly rooting cuttings at scale so any advice is much appreciated!!