Hi, I am in the same position, thay are in 3 inch pots and doing really well.
This is our plan, but someone please jump in if they can tell me a better way.
Today we took the bags that potting soil comes in, rolled the top down neatly until about half the sixe, put drainage holes in. Jign put a couple of spades full of regular soil in to weight them down then filled with potting soil,They hold a lot of soil and are much bigger than any pots or growbags I have. We were going to transplant them today but ran out of time, so it will be tomorrow now.
They are going in my big old greenhouse, it has just a grapevine and a few melons in,the idea was that they could ramble out of the bags and wherever they liked on the earth floor.
Would that be OK????
XX Jeannine