SwissChamp, Black, 91mm by Victorinox

If you are reading this you know it: this is the ultimate practical tool. Not perfect, as nothing is so; but for the size and money you can't get anything more handy, sturdy, etc. I had it for 15 years and now somebody else is enjoying it (new except for the black plastic sides). I didn't even do any maintenance of it except some wiping with a handkerchief when it got dirty. Now I'm just going to buy another. Unless you need some heavy-duty (folding pliers from Victorinox or Leatherman, that I also have), the Swiss Champ will help you every day at the office, home, car, camping, etc.