It's one thing to keep a rod, reel, and tackle bag stashed in the back of the truck for impromptu stops at the pond. It's another to have a kayak tucked away for impromptu paddling into those lily pads on the far side of that pond. Check out this video that explains the concept behind portable Oru Kayaks. Though I'm not sure I'd take one out in gnarly whitewater, it seems like a useful tool for the largemouth lake or smallmouth stream. You can pre-order one here for $850.