F28 update - Bag seed 1 scrog in 5L hempy and friends in smaller hempy buckets.
https://www.reddit.com/r/fubargrow/ has the latest update.
Main scrog is in a 5L hempy bucket - they really, really rock.
I'm also stoked by an experiment with half a dozen 2L milk containers as hempy buckets - cut off the top, drop in 2" perlite below a drain hole, backfill with prepared coco and transplant your clone. Volume is only about 1.5L total but I'm seeing very good growth.