Freya Hoffmeister has been using one of these bags... in custom black of course... for her circumnavigation of Iceland, circumnavigation of South Island New Zealand and for most of her Australia solo circumnavigation. Finally the bag grew tired and she's getting a replacement for the rest of the trip!
You'll find a couple of Nigel's tow-line systems in the stores, produced by Extrasport. One is a stand-alone system, the other a retro-fit accessory to PFD's such as the Retroglide Sabre by Extrasport, which has belt loops and a storage pocket that will accommodate the tow-line.
Both these systems use webbing in place of line. Webbing can be quickly flat-coiled for stowage and uncoils cleanly and rapidly for use.
The stand-alone system, the Extrasport NF 2.0, is lightweight, floats and the webbing stows easily into its mesh storage pouch. It s a waist-tow system. Nigel's ingenious "easy-tracking" system allows the tow-point to run from hip to hip without pulling the release buckle from its position at the front, making it easier to locate whenever a rapid release is needed.
The integrated tow-system, the Extrasport NF 1.5, quick-releases from either of two hip-located release tabs. You can use either left or right hand to release.
The webbing flat-coils into a pfd pocket, so the system is always at the ready whenever the pfd is worn.