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DO NOT go with a folding survival knife. The locks will fail (happened to me). You just cannot get the same strength as a fixed blade in a folder.

Ontario Rat 7 is a great knife. Geared towards large and heavy duty tasks mainly. You really can't go wrong with any survival knives from this manufacturer.

If you want something mid sized, maybe light duty fire making and camp knife try something like the Coldsteel SRK or a KaBar. KaBar wins for value in my mind. A Glock field knife would also fall under this category, and is dirt cheap for what you get.