I've seen those, Mouse....I'm talking about the 4-5 foot ultralite spinning rods. Those are usually one piece. Probably someone, somewhere makes a take down version but I'm not willing to spend the money for one.
There are "travel rods" that are very short, 18in, that actually work very well for hiking creeks, and are indestructible. Haven't bought one yet.
Some are telescoping, some look like retasked car cell phone antennas.
Like this:
http://www.emmrod.com/