I've heard good things about the alpacka rafts. They even get a bit of whitewater use by experienced paddlers. They're light, portable, and reasonably durable. They do cost close to $800 though, so if you're only getting a raft in case you need it for a hurricane, you could buy a dozen Walmart rafts for the same price.

And for fun, here's some class III whitewater packrafting in Alaska:



It looks like you can even carry a reasonable amount of gear on one!