USAF Issue Pilots Survival Knife <img src="/images/graemlins/smile.gif" alt="" />
All the KaBar in a smaller package. 5" blade. Inexpensive, but ruggid and well built. It's beefy enough to take a beating, and if you do manage to break it, you're out less than $30. A great deal stronger than folders for heavy duty general purpose camping work as well.
$19-29


Course, I carry several knives.... For 99% of situations, a decent folding pocketknife will do what you need done just fine (cut rope, whittle, that kind of thing).