I recently bought the Lowel Caselite 2-bulb set, based on suggestions from Mary Lane Reed and Steve Moppert. I love it. The case is somewhat heavy and awkward but it does fit in the overhead luggage carrier. It sets up easily and has the option of one or two- bulb lighting. I have been getting gorgeous photos.
The daylight bulbs are 5300K, so not as cool as those 6500K bulbs, but very nice.
The light comes with a sturdy compact tripod (I dont' recall whether I ordered that separately) so that it can be elevated for a 45 degree angle - many tripods simply will not go up that high.
http://www.lowel.com/caselite/