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Are you aware of all the various types of knife blades on the market? There are a lot of designs to choose from. One thing is for sure, if you are going to count on a single tool for survival you are going to look towards the full tang survival knife. Its just too good for too many things. This is an important consideration to make. Any old blade will not do. If you are going to survive in the wild or in an urban setting a lot of it will come down to a reliable knife. I would also recommend getting one that attaches to your belt. This makes a big difference.
This is a great article that offers up a breakdown of the several types of knife blades. I think you are going to enjoy this one and you might find yourself making a change on the knife you carry.