So did I. I also had shoes, a pen, a hammer, a compass, a calculator, a ruler and many other useful things.
And you carried all these things around in your pocket, everyday?
These days, I keep tools at a bench or in a vehicle. I ain't gonna whip a crappy screwdriver-slash-can opener out of my back pocket to fix nothing for no one, lol.
If I know I'm going to be out for more than a quick run here or there, I will often slip a 1.5" pocket knife off the bench and into the front pocket. 99% of its reason for being, away from a bench, is opening packages and cutting down the boxes. That's about it. At the bench, with other tools and materials and lighting to work with, it is quite a bit handier.
Opening letters/bills, sure. I am doing that at a desk/bench. Usually opening packages and processing the cardboard and packaging at a work bench. Usually doing anything with tools at a bench. And if the work can't come to the bench, I shall usually have to pack the right bag, and it probably won't include a swiss army knife.
That said, I have several multitools. The only ones I use much are Gerbers that are essentially pliers with a few odd bits stuck in the handle. And the last time I ever used them for anything more than pliers, I can't remember. But they have good (the best, I daresay) scissors for a multitool, if it comes to that.