Maybe a poncho is something somewhat alien for you, but we highly recommend that you get one, especially considering the European weather picture which, as we all know, is not exactly rosy most of the time, and threatens to ruin most of our outdoor excursions: it is also a superb elemento for your survival kit.
The best way to use a poncho is to have it always at hand; it will do little good to have it deep in a backpack, only to spend five minutes to take it out under a torrential rain or heavy snow. As a survival tool it will be useful if you have it at hand!
A poncho used to cover wood from rain and weather.
You should always carry it folded outside your pack, where you will get it quick enough in order to cover yourself and your gear. One poncho per person will be required in any trekking, hiking or biking party, as well as in the case of most outdoor activities; especially large groups may also carry a spare poncho, just in case, and the same applies in the case you go with pets or a lot of backpacks and gear that may need additional protection.
The best ponchos are made with waterproof, rubber-treated cloth; military ponchos are excellent, as long as you don't mind suing the same olive drab, black or woodland camouflage variants. They are very resistant and really worth the price. Other ponchos may be lighter and their quality, not as good.
People covering themselves with their individual ponchos during a trek.
With some practice you will be able to use ponchos under the most varied circumstances, both during happy treks as well as during emergencies and survival situations. But these can also prove useful for you in your everyday life, as a shield to Murphy's law: carry one in your car or vehicle, so that when it stops, suffers a flat tire or engine malfunction while a deluge is raining over you in the middle of a highway, you will not get soaked before walking three steps outside.
A poncho used to cover a backpack during a rainy day in a forest.
So, we recommend you to make a small investment and purchase one of these before your next excursion or weekend escapade.