Well, a lot of it is just definition too on how you define "survival" kit versus "stuff I need to live" kit. I mean, realistically, a quart of water is needed to live if you're off on a 3-day backpacking trip, but few of us would call it that.

For example, I don't consider a jacket and lunch with 2 qts of water anything unusual for a dayhike. I'll toss in my altoid-tin PSK. If I'm on a 7-day trip through the Sierra Nevada's, typically my PSK is there too. Everything else is considered necessary for the trip - 10 essentials, clothing, food, water, tent, etc. So, to me, a PSK is truly a last ditch, holy crap where's EVERYTHING kit. Ie, I don't carry a 10lbs kit, I carry 10lbs of gear and a 0.5lbs kit.

The one exception I can readily think of is when I spent a month in Alaska. there I took a backpack on my plane rides, specifically as a survival kit. I figured I wasn't camping/hiking and it was designed expressly to keep me alive for a few days in the event of a plane crash. I didn't break it open at all the entire trip, until I left and used the bag as my carry-on.

In my car, I have a car kit, but even that has a smaller PSK. That kit is about 3-5lbs, but I don't carry it.

I guess your answer is, my PSK is worth my back pocket. Sometimes a bit of belt real-estate too. But it's rare that, when I'm out, my backpack isn't with me. If I'm on a long trip, almost always I'll have a few smaller pouches that I can stuff things into, if I'm not carrying a camelback (hate them). Does that answer your question?