Laugh but know this; only a total psycho would fight with a Hello Kitty knife.
Survival Knife: You need the knife, of course, but this will come with thread, needles, matches and all sorts of goodies that can be the difference between life or death.
Knife: Just a small pocket knife will do, for cutting rope, clothing, bandages, etc. And there are still those cave zombies to worry about...
Swiss Army Knife: With a classic Swiss Army Knife than someone who’s trying to fend off looters and mutant killers with their bare hands.