My knife carrying has gone through 3 different phases: slip joints -> multi-tools -> single blade lockers.
First phase was Boy Scout knives, which I've had since I was 8. This led to a few SAKs, mostly on my key chain but I never took the SAKs. All of the ones I've owned (Victorinox) lost their scales quickly and had tools that either didn't open, didn't work well or ended up breaking. In particular, the Victorinox scissors have a very short useable life. I also never took to the narrow profile stainless blades of the SAKs and preferred the wider carbon blade of the Ulster BSA knives. The last traditional slip joint that I got was after I was married as a gift. It was a nice Camillus 2 bladed jack. The blades were just too small to do anything with them. In any event, I almost never carry a slip joint any more except for an old Ulster Camper which I carry occasionally for old time's sake.
I got my first multi-tool after college. I was backpacking a lot and pretty into bike touring. I got a small SOG tool but ended up getting terminally frustrated with it. Pliers didn't work well and it was horrible screwdriver. Years later, I tried a Leatherman Wave, which was a bit better but weighs about 10 pounds. And, on both tools, I've managed to wreck or bend screwdriver blades. Feh. Eventually Leatherman came out with the Micra and now I keep either a Micra or a PS4 in my briefcase and backpacking 1st kit. I do this primarily for the scissors and small pliers. I like the small multi-tools better than any SAK I've carried and while I still dislike using the tools, they're better than nothing. I don't EDC them, but I keep them nearby if I need them.
Like many people, I got a Buck 110 as a young man. Great knife for hunting and such but way too big for pocket carry. Tried it backpacking but again it's too heavy and truth be told, I didn't care for the clip point blade. About 5 years ago I bought some used bike parts and got a used and pretty beat up Opinel #8. I cleaned it up and, on a whim, started carrying it. I've not been without a single blade knife since. I've tried several different knives since then. I have a shorter Schrade 5OT in 1095. Easy to carry but the blade is too short for kitchen use. I got a Buck 500 in stainless. Shiny, thin. Nearly perfect. But, I missed the wider belly of the old Ulster Camper and started to get itchy for a wider blade than either my Opinel #8 or Buck 500. So, I got an Opinel #9, filed the blade down to a drop point and reduced the handle down to an easy open style about the size of the #8.
Here they are:

Lockers by Pinnah, on Flickr
The Buck 500 (bottom) and the modified Opinel #9 (second from top) are the most carried. Really, the Opinel #9 is just about perfect for me. It's insanely light and the handle fits my hand like it was made for me (in truth, it was, cause I made it). But, most of all, I love the blade. The shape is perfect for all kitchen use and meals and yet it's tough enough for use in the shop. The 1095 sharpens right up in a hurry.
First phase was Boy Scout knives, which I've had since I was 8. This led to a few SAKs, mostly on my key chain but I never took the SAKs. All of the ones I've owned (Victorinox) lost their scales quickly and had tools that either didn't open, didn't work well or ended up breaking. In particular, the Victorinox scissors have a very short useable life. I also never took to the narrow profile stainless blades of the SAKs and preferred the wider carbon blade of the Ulster BSA knives. The last traditional slip joint that I got was after I was married as a gift. It was a nice Camillus 2 bladed jack. The blades were just too small to do anything with them. In any event, I almost never carry a slip joint any more except for an old Ulster Camper which I carry occasionally for old time's sake.
I got my first multi-tool after college. I was backpacking a lot and pretty into bike touring. I got a small SOG tool but ended up getting terminally frustrated with it. Pliers didn't work well and it was horrible screwdriver. Years later, I tried a Leatherman Wave, which was a bit better but weighs about 10 pounds. And, on both tools, I've managed to wreck or bend screwdriver blades. Feh. Eventually Leatherman came out with the Micra and now I keep either a Micra or a PS4 in my briefcase and backpacking 1st kit. I do this primarily for the scissors and small pliers. I like the small multi-tools better than any SAK I've carried and while I still dislike using the tools, they're better than nothing. I don't EDC them, but I keep them nearby if I need them.
Like many people, I got a Buck 110 as a young man. Great knife for hunting and such but way too big for pocket carry. Tried it backpacking but again it's too heavy and truth be told, I didn't care for the clip point blade. About 5 years ago I bought some used bike parts and got a used and pretty beat up Opinel #8. I cleaned it up and, on a whim, started carrying it. I've not been without a single blade knife since. I've tried several different knives since then. I have a shorter Schrade 5OT in 1095. Easy to carry but the blade is too short for kitchen use. I got a Buck 500 in stainless. Shiny, thin. Nearly perfect. But, I missed the wider belly of the old Ulster Camper and started to get itchy for a wider blade than either my Opinel #8 or Buck 500. So, I got an Opinel #9, filed the blade down to a drop point and reduced the handle down to an easy open style about the size of the #8.
Here they are:

Lockers by Pinnah, on Flickr
The Buck 500 (bottom) and the modified Opinel #9 (second from top) are the most carried. Really, the Opinel #9 is just about perfect for me. It's insanely light and the handle fits my hand like it was made for me (in truth, it was, cause I made it). But, most of all, I love the blade. The shape is perfect for all kitchen use and meals and yet it's tough enough for use in the shop. The 1095 sharpens right up in a hurry.