I don't want something that is Navy SEAL approved for hand to hand slaughterfiesta or is the latest and greatest internet mall ninja "tacticool" blade that can cut through UN buildings. I'm looking for something with a very good serrated edge, polymer frame, with about a 3.5" blade or so on it. Something you could cut through a seat belt, cut a rope, etc. with. One of those handy tools to have around kinda knifes. Any suggestions?