I carry two folders everyday at work. One is a Benchmade mini-barrage, the other is a Victorinox Tinker. Both see a lot of use daily but the Tinker does the bulk of the work.
When not at work I carry the mini and a Victorinox mini-Tinker.
Usually both in the left pocket.
We all carry belt knives at work...very, very cheap belt knives. I work in a paper mill, lab tech/rat. It is surprising how much use and abuse we put these cheapo knives through. Paper, especially heavier grades will dull and wear a blade worse than sandpaper. The mill provides us with coarse dry stones to sharpen them with and we might use them several times a day.