Sgian dubh as a work knife...

[ShaunMaxwell]

Given that what you're needing is a utility knife, I'm not sure I'd go with something like a sgian dubh, as sgians generally provide no protection for the fingers in the event of slippage. You might consider something like this if something like the Cold Steel Secret Edge or Braveheart doesn't fit the bill (both of which are very grippy):



This knife is available with a 4" or 5.5" blade, is sharp, holds an edge well and is inexpensive. I carry one attached to a pocket on the back of my book bag daily for my commute via public transport and have been well pleased with it.

http://www.midwayusa.com/product/115...r-handle-black

EDIT: Given that you're a Texan, you'll want to avoid a double-edged blade, lest you run into difficulty with local law enforcement!