Alien II. It pretty much beats the clumsiness mentioned earlier, because it separates easily into two halves (and the tongues on the tool double as tire irons. Chain tool, spoke wrench, just about everything you might need. For big tool jobs -- pedals and headsets, you might have to stop and beg a wrench off somebody. I had to once. No problem.

Now I make certain everything is tight, and that threads that should be greased are greased and the other stuff that shouldn't be is treated with threadlocker.