I just put one of the Hydro Wicks into some fabric bags I had bought and never used. Perfect fit. All I would really have to do is cut out a hole to fit the hydro Wick cup.
I purchased these bags to use with the AC Infinity self-watering system, but ended up not using it in favor of the Octopot
2 to 3 inches shorter than the rocket sleeves which are already shorter than the original sleeves by an inch or so. I wonder if that would work and give the moisture gradient needed.