Back when I was young and working construction, I carried a Stanley Utility Knife (i.e. Sheetrock knife) in my nail apron. It cut everything - sheetrock,insulation, trimmed wood, cut tubing, plastic & tile. I would wear out 2-3 blades a day. My pocket knife was rarely used at work. Today, I carry various Case & Schrade folders, bur when I'm working around the house on a project, that same Stanley utility knife is always handy.