I recently completed an 80-mile traverse of the Wind River Range that required negotiating several lakes walled-in by massive granite cliffs. The majority of the route was trail-less and crossing these lakes by packraft the most efficient means of travel. The route also involved cross-country scrambling over high alpine peaks and passes where every ounce counted.
Two-Pound Packrafting Kit - http://forrestmccarthy.blogspot.com/2013/08/two-pound-packrafting-kit.html