pretty much just some rope in semi-strategic places. some knots held in place with zip ties. i used some wrong sized tubing a jerk at a worthless HBS in Knoxville sold me as handles to make it a bit easier on your hands. it holds up great filled with water and is much easier to carry than nothing at all.
(the top rope is there just to keep the whole thing from sliding off the carboy)
the rope also acts somewhat as a buffer between the glass and whatever surface you place it on.