Well, I live in Canada, so my weapon choice is limited. So just a knife. But it's a nice knife. A quick release with a bit that cuts seatbelts and a thing that shatters glass. Love it. :)

I have one knife in a sheath on my bag strap and another on my belt ( but that one is part of a Leathernan multi-tool ). I’ve thought about getting a third one. But then that might be overkill…