forestwalker
Bushcrafter (boy, I've got a lot to say!)
Excellant thread - my only contribution is to express my amazement when the discussion comes up to find people take their PSK tin OUT OF THEIR RUCKSACKS!!
If you have a rucksack you dont need a PSK.
To be fair it might be a case of normally keeping it with the pack, but taking it out when taking side trips, or when just out for a few hours picking berries or mushrooms.
When I teach I and i come to the topic of survival kits I usually have my fully packed ruck standing close by. First we talk about what functions one might like covered in PSK (shelter, fire, first aid, repair, etc). That perfectly describes a filled Berghaus Atlas, with sleeping bag, basha, Trangia, etc. Then we all agree that no sane person carries all that when out picking blueberries for an afternoon in central Sweden.
My knife with ferrocerium stick on the sheat is on the other extreme of the scale; it is a minimalistic tool set to make it easier to overcome lacks or to manufature the stuff you might need.
A PSK covers the gap between these two extremes. It can be tossed into the pack or basket you carry when out hunting, fishing or berry picking. It can live in your car. It can be crammed into a pocket when you go off to find the neat caves a few km away from the river you are canoeing. It can live in a pocket on your lifejacket.
What items go in there depends on your skill level and what kind of emergencies are realistically possible in your situation, be it a broken leg, getting lost and seeing sunset come, zombies from heck that eat your pet budgie or that a bear chases you up a tree. Think "what items would make my life much easier in that situation, and are reasonable to carry?" Look at Mors list. That is how it is organized, that is the logic behind each and every item on it.
It does not even have to be a tin, it can be a habit of having a SAK in your pocket and using firesteels as keyfobs. It can be having a knife with a firesteel and a few yards of cord around your neck whenever you are out in the woods. It can be carrying an axe whenever you go away from camp.
I actually advocate the "pocket habits" version over the classical PSK, since it is harder to loose all the stuff you are carrying, and makes you more familiar with the stuff in your kit. If it is your normal knife, firesteel, cookpot, or axe then you -- presumably -- know how to use them and what you can do with them.