I bought these for the guys working for me, and they love them so I just got one for myself too. It's called a Superknife, when the blade gets dull, you just flip the utility knife blade around, or replace it with a new one. I've got a construction business, and regular knifes I dull out in minutes if I don't have a utility knife handy. Unfortunately a utility knife is not nearly as convenient to carry as a regular knife, this has proven to be a great solution.:
One of those in combination with the leatherman wave is the way to go. Between the two of them I have just about everything I need in a pinch. The great thing about the wave is you don't have to open it use either of the knives, the saw or the file, which is very convenient when you're holding something up or otherwise have one hand occupied.:
