I just had an ah-HA moment today sharpening some old knives. What if the SHTF and while using your flint lighter, cutting branches for fire wood, etc. your knife goes dull? What are you going to do? You can really ruin a knife trying to sharpen it on a rock. I have a little knife sharpener that is hand held and works great. It's not a wet stone type, but one of those that has two carbide blades in a 'V'. All you need to do is run the blade through it several times and you have a brand new razor sharp blade. This would be, IMHO, an excellent addition to a BOB. I'll try to post pictures of mine tomorrow. A dull knife is a pain in your arse, not the BG's.