The one essential tool for survival is a hunting knife. It can be used for hunting food, securing shelter and protection. When my husband was a kid, he and his brothers were expected to produce their pocket knives on demand. His parents and extended family felt it was an instrument that no male over the age of twelve should be without.
There is a vast array of knives from which to choose. Purpose is of course a deciding factor in making a choice. However, the single most important factor, in my estimation is the quality of the knife. A high quality knife will last much longer than one of inferior quality. My suggestion would be a steel blade. There are different types of steel blades.
Outdoor use is by far the most common environment for a knife to be found. Knives come in handy on land as well as in the water. Hunters, campers and hikers use them on land. Fishermen and divers have aquatic uses for a knife. Divers often carry knives on their expeditions. There are documented instances that saved divers from either predators or dangerous entanglements. Not all water lovers are divers. Fishermen also take advantage of the usefulness a knife provides. Cutting lines and cleaning fish are just two of the tasks for which they are used.
Using the internet to find the knife that is right for you is a wonderful idea. I caution, however, that the large selection can lead to confusion. Keep the following in mind.
The size of the knife depends on the intended use. Even that needs to be correctly assessed. For example, if you plan to pursue game, the size of the game dictates the size of the knife. A large knife can be cumbersome and dangerous.
The frequency of use also comes into play. Those using a knife on a regular basis probably choose a folding knife that can be folded and carried around on one's person. My most helpful hint is a repeat of what I have said many times. Have a collection of knives to fill any bill. Check out our selection at Hunting Knife Outlet.