[quote=@Harbinger]
I suppose a knife would be okay, but not worth much. A shiv could easily be made on the island.
[/quote]

The main differences of the knife would be its size and quality (much better than an average shiv made from scrap metal or somesuch), but that's what I figured. I'm not expecting it to be a huge game changer, though it ought to help against the shambling corpses we're sure to come up against.