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From here at Andinia we recommend you to purchase a survival kit and a vest, if you have not already done so; if outdoor activities are dear to you and you often go into the wilderness, you will certainly need to have some sort of survival equipment or gear at hand, anytime. The kit does not need to be expensive or sophisticated, but it must be functional, lightweight and comfortable to carry; if you purchase a bulky thing, you will tend to leave it at home, and if it is expensive, you will be afraid of using it until it is too late, perhaps; and you must carry it at all times.
We can take the example of present-day combat pilots: they know that they can pass from the relative comfort of a cockpit to a dire survival situation in just a matter of seconds. If they eject for whatever reason and then parachute into the ground, they will have to evade capture, return to their lines and also survive; and then, they might as well be wounded.
So they need to carry their survival equipment with them, in a specially designed vest. Of course, the kind of survival gear that a member of the military carries may not be the same required by an outdoorsman or adventurer, but the concept remains the same so, mountain climbers, trekkers, campers and similar people will do well by carrying their own essential stuff in a vest.
Don't forget that leaving your survival kit at home is not the only way to have it unavailable during an emergency: avalanches, falls and the nature of vehicular accidents may cause the loss of things in your pockets, your backpack, etc.
A vest offers the best chances in this regard, plus, you can wear them no matter the temperature and weather around you.