What do you guys use for a spare/emergency paddle?

This.

I never updated this thread, so here it is.  After having my primary paddle break during the rockfish opener this year, I upgraded my back-up paddle.  The guys that recommended having a full paddle were right. 

I wasn't in my Hobie, and one side of my primary paddle snapped off. My emergency paddle was one of those single, collapsible jobs.  But, I used my broken paddle because I figured it was still better than that collapsible one.  Luckily, conditions were decent enough that I was able to make it back to the launch without too much trouble.  However, using a single paddle took way more time and energy than I expected for what should've been an easy 1.5 mile trip.  I learned that I definitely wouldn't want to do this in rough waters.

So, I got rid of that collapsible paddle and carry a 4-piece paddle as a back up now.  It's heavy but I can easily pull it out of the hulls of all my kayaks, and I'll have full control/propulsion when I need it.

I picked up one of those cheapo telescoping single paddles but am skeptical of how well it would work.  I would have been better off to just have asked on the board.  Live and learn I guess.  Thanks for the input.

I carry a full size carbon fiber paddle in my hull. Those little hand held things won't get you too far in bad conditions. Weighs about 1.5 lbs.

I keep the original one that came with the kayak in the hull.
I've purchased another one to use as my main.

Yeah, my thought is... why add more stress for times when you'll be in distress.
especially when I have room in the hull.

the update here was a great contribution. Backup paddle is not something that always crosses the mind of a paddler...until one is needed