IMO small PSK's serve two purposes; a redundant emergency gear (as someone else mentioned) in case you've lost your main gear, and to serve as a thought exercise for people to get them thinking about the subject of survival or emergency preparedness in the first place.
That last bit isn't just fantasy stuff, it's useful in getting your mindset where it needs to be as well as improve your abilities so that the end result is that you're less likely to find yourself in a situation where that's all you have in the first place. Ideally you'd never have to use it.
Along these lines, building your own PSK is probably the more effective route than buying one from a store because you have a chance to think about what goes in, why, and where you need to splurge on quality gear and where you can make due with basic stuff. It will change over time. Most important once you seem satisfied is testing it. Personally PSK's got me interested in the subject of preparedness in the first place. I store bought one, then decided I could improve on it -- dozens of changes later (and more money than I care to admit I spent) and I'm pretty happy with it. Then I moved onto bigger things.
I admit when I first started, I picked the container (hell that's pretty much all I used of the original kit I bought) and was just cramming stuff in. Over the various iterations however, I've found the proper order is to decide where the PSK fits into the grand scheme of things (stand alone or just there to supplement the EDC?) first, then decide what you need to fulfill that role, and then decide what container you'll use. Yeah, a lot of times it's done backwards, but it's a learning experience.
That last bit isn't just fantasy stuff, it's useful in getting your mindset where it needs to be as well as improve your abilities so that the end result is that you're less likely to find yourself in a situation where that's all you have in the first place. Ideally you'd never have to use it.
Along these lines, building your own PSK is probably the more effective route than buying one from a store because you have a chance to think about what goes in, why, and where you need to splurge on quality gear and where you can make due with basic stuff. It will change over time. Most important once you seem satisfied is testing it. Personally PSK's got me interested in the subject of preparedness in the first place. I store bought one, then decided I could improve on it -- dozens of changes later (and more money than I care to admit I spent) and I'm pretty happy with it. Then I moved onto bigger things.
I admit when I first started, I picked the container (hell that's pretty much all I used of the original kit I bought) and was just cramming stuff in. Over the various iterations however, I've found the proper order is to decide where the PSK fits into the grand scheme of things (stand alone or just there to supplement the EDC?) first, then decide what you need to fulfill that role, and then decide what container you'll use. Yeah, a lot of times it's done backwards, but it's a learning experience.