There is still another way to look at it
You may not even lose your bag to need the PSK

It happened several times that someone is stranded and the stuff in their bag is consumed before they are found. It is a relief that they still have something else (the PSK)

A few decades ago, I used to drive a motorbike. It didnt have a fuel gauge , but rather a valve under the fuel tank. In position zero it was closed. in position 1, the engine has access to about 90% of fuel in the tank. When motorbike engine shuts down for lack of fuel. I twist the valve to position 2 to access the last 10% of fuel and head directly towards a gas station.

So, a PSK can help you if your main supplies run out, and give you "another chance".