I am likewise intrigued by packcrafts, particularly after seeing a video of people floating the south fork of the Flathead River in them.

My buddy who has considerable whitewater rafting experience, and who recently floated the SF of the Flathead in a 9 foot pontoon boat that was carried to the river on the back of a horse, thinks I'm nuts.

Although he did say he saw plenty of people using them, they looked very unstable and unmaneuverable to him.

He also said you can take three days to backpack into the river with the packcraft, or you can have a pontoon boat carried to the river in a day on horseback. He makes a good point.