The large Earthtainers use 31 gallon totes, but the soil capacity is 24 gallons. The half water barrel SIPS are 27 gallons, but probably about 21 gallons of soil.
The wick on the Earthtainer is a 5" net pot filled with peat/ perlite mix. Here's the design I used by Ray Newstead. His manual rocks and he has a great non-profit to help areas of the world with poor growing soil.
http://earthtainer.tomatofest.com/pdfs/EarthTainer-Construction-Guide.pdf
For the water barrel I used a 4 - 5" layer of clean agricultural sand for the wick. I coil a 4" perforated ag pipe with a drain pipe sock around it to prevent sand from getting into the pipe. This acts as the reservoir. The sand fills in around the pipe and covers it over.
In both designs I like to use a couple layers of weed barrier between the growing medium and wicking medium to prevent roots from growing into the reservoir. I don't like roots in the res. I think this might be the flaw with Autopots which I will be attempting to remedy.