out of all the items that I have seen listed in this thread, most are not necessary. the matches, fishing line, etc. You can start a fire without matches and catch fish without a hook and line. however, for a survival knife the idea is to survive. someone posted what I thought would be the items to have. Pain meds, antibiotics and water purifier pills. if you don't have a fire arm, the knife will provide everything else.

just my take