Think of your complete survival kit as something that should evolve and change according to your needs, rather than as something that you assemble once and toss into your pack each time you travel. Survival is is situation specific, and certain tools that may help you in the Arctic or the boreal forest will do you little good in the desert or jungle.
And as you’ll soon see, different forces are at work in different areas. Ignore them at your peril. If I’m going tripping in the boreal forest of northern Ontario in the middle of May, the first thing I know I need is bug netting, which is specific to that region and time of year. Do I need to pack bug netting if I’m skiing across the Arctic tundra in the middle of November? Nope. It’s important that you take these factors into consideration before every trip.