There are activities during your trips that may be more dangerous than others, such as mountaineering, adventure sports, walking on glaciers or simply taking a long walk alone in an area where it is easy to get lost.
Although I do not usually look at these things because I never get worse, it may not be a bad idea to carry a backpack in your backpack. survival blanket. Having - once deployed - the ability to cover two people, it fits in the palm of your hand when it becomes compact and is surprisingly light. It also has a series of first aid and survival rules written on its surface and a bright orange color that will help locate you in case you are looking for a rescue team.
It retains and reflects 90% of the body heat radiated by people who are covered by it and only costs about 4 euros.
Perhaps something that is not too much to carry in the backpack if you are going on a mountain or dangerous route.