Every day carryI've carried some model of Victorinox pocket knife ever since I was 7. My dad gave me his old one, and I proudly took it everywhere with me.
I particularly like the huntsman model, because it has scissors and a saw, but is not too thick to hold comfortably. Some Victorinox models have so many tools that they won't fit in your hand!
I carry this in my pocket every day, unless I'm flying or entering another controlled environment where blades aren't allowed.