Easy, infinite-length portaging: tie two small rope loops (3" dia or so) around the portage yoke. Wear an external frame backpack with the top cross bar removed, leaving the vertical post ends ("horns") sticking up. Slip the rope loops over the horns, with the yoke behind the horns. This puts the entire canoe weight on the packframe instead of the neck. Ballast the canoe as needed so that the balance point is a touch behind the portage yoke, and hand-hold a bow line to keep the canoe level while walking.
