First, how about a gear forum. People loves them gear forums : ).
Over at BPL, there was a post about lightweight life jackets with the MTI Livery coming in at less than one pound, if I remember correctly. Ryan Jordan said his inflatable was around 9 ounces. He seems to hate using it though. It would seem easy to make a jacket out of closed cell foam with straps attached. I know they would not be approved, but what is the likelihood of a ranger ticketing you in the Alaska wilderness? It would be better than nothing and it could be used as a sleep pad too maybe. Hig is using his modified thermarest on their current trip.
Brad said:
When faced with the choice of carrying a heavy and bulky PFD or “boating naked” many packrafters choose the latter. There is a safer alternative, though. Stearns makes a compact, lightweight inflatable PFD that weighs approximately 1 pound and compresses to the size of a softball. The item is called the “Stearns Inflata-Vest Manual Inflatable PFD” and is available in Anchorage at B&J’s for $70. It is Coast Guard approved as a Type V PFD, but it is not intended for whitewater boating. It is vulnerable to puncture, so it may not be an ideal choice for a river with lots of sweepers. But it is far better than no PFD at all.
Brad Meiklejohn