You thinking along these lines ?View attachment 965026
Or more View attachment 965027
Or even
View attachment 965028
How about tieing a knot in them View attachment 965052
Yeah, container size and genetics will save you the effort though. I remember using grow bags when I grew Danish \ Finnish \ Canadian \ Russian plants outside. The smaller container the smaller plant, also getting root bound for these genetics triggered flowering, so double benefits.
Oh well, I am starting to think 1gal grow bags are too big, that is 3,8 liters and not what I consider a really small pot. Might have to check out those 1,7 litre ones.
Still hoping someone will chime in on what wattage I can go with for my space though