Originally Posted by Valiente
Jim, consider a Portabote. They fold down to wakeboard size and can be lashed to the lifelines. The seats and the oars are a pain to stow, but they are light and can conceivably go down a cockpit locker right into the "dead zone" at the transom.
They row well and are dry. If you want a motor, you can stash a Honda 2 HP four-stroke (28 lbs) anywhere and I've had that combo out in near 20 knots...wobbly but serviceable and a good three point five knots into the waves and wind. Seats four.
We took a close look at them at the Southampton Boat Show, but our boat is pretty small to have something like a Portabote lashed to the lifelines. I like the open decks, as much as possible, but the small, flat package they make is really amazing.
The UK magazine Practical Boat Owner did a review of four folding kayaks, some of which can fold down into one or two duffle bags and be stored below. They are expensive, but I like the below decks idea, and the option to go on early morning explores up inlets and the like.
Feathercraft Folding Kayaks - Compare Features
The magazine review said you could rationalize the price if compared to a dinghy and outboard motor, gas, etc...