Survival situations vary and not all occur in the bush.
Not all situations where a Multitool would be useful are life or death, but I find I get into a lot of situations without my toolbox on hand.
When I go hiking in relatively populated areas, no one looks twice at the Charge Ti, but I've gotten more than a few looks with my other knives strapped to my hip.
When I go further out on hikes or camping my other knives come out, but they're not folders. Even so, I have my Multitool with me and have used it.
While I've taken courses on primitive tool making, and can utilize stone, wood, bone and so on to make a lot of the things I might need in a survival situation. Sometimes I can make the job easier with my Multitool.
I'd rather make a fine point on a bone hook with my Charge Ti's file than sand the bone down on a rock, but that would only be necessary if I lost the hooks in my PSK.
Even though I can break antlers for use in knapping by using an angled edge on a stone to create a place for a controlled break, or use fire to weaken a breaking point for that matter, my Multitool's saw is faster and cleaner. In regards to knapping, I once used the small phillips head tip firmly placed in my Charge Ti to knap a point on an small arrow. Granted I'd prefer the controlled leverage of an Ishi stick, but in a pinch it worked.
If I need to cut rope, straps, or even cordage I make, the serrated blade comes in handy.
I trimmed a hangnail while on the trail with the scissors.
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"Learn survival skills when your life doesn't depend on it."