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The four essentials are a form of emergency preparation by brainstorming and organizing a kit of tools that may be necessary in the field. There are other methods of the same principle such as the ’10 Essentials’ that cover many of the same ideas and tools that the four essential method does, however, the four essential method is superior because of its ability to make the user think about the activity, environment and hazards of any given trip and prepare the kit accordingly. Therefore, a proper four essentials kit will change for every trip and will be thought trough and well planned to meet any challenges the user and their group may face. The four essentials are equipment to fix people, equipment to fix gear, communication and navigation.
There are many options when it comes to carrying your four essentials kits. Consider where in your pack or gear will be most accessible and obvious as you may not be the only one retrieving the kit. The top portion or brain of your pack is a great accessible place for your kit and will likely be the first place someone would look for items needed in a pinch. Some carry systems have dedicated emergency pockets or zippers that are labeled as such (i.e. first aid colored zips / pouches) that are highly visible and accessible which work as well in various pack systems. On boats, choose spots as close to your cockpit or seat as possible for the fastest possible access. Also consider putting smaller items in the pockets of clothing for even faster access.
With regards on how to carry your kit, brightly colored and labeled drybags work well in pack systems as they are light weight, protective and easy to spot. For wet or snow conditions, you may be more inclined to carry a waterproof or hard-shell container such as a Nalgene or pelican case’ to better protect your gear from moisture and rough conditions. While protective, these containers are much heavier and may not be practical on some trips.
Simply because you never know.
As a adventurist, the four essentials are used to maintain your own experience and gear. Nature is inherently unpredictable and having a quickly accessible kit of gear specifically designed to your needs can get you through and out of almost any situation. It also gives you the confidence to approach any activity knowing your prepared, ready, and capable of sorting out most issues with the gear on your person.
Its always better to be prepared for the inevitable hiccup or bump in the trail. Plan for the worst Hope for the best.