In my experience it is always easier to critique others bags than to critique my own. Problem is I tend to get into a train of thought and fall in love with my choices.

One of the first times I went camping I must have carried three lighters, matches, a match safe with lifeboat matches and a couple of flints. And probably what amounted to a half-pound of assorted tinder, birthday candles, Vaselined cotton, char cloth, and, if I remember right, a road flare. In a series of quite logical 'what-ifs' and 'might-need' and 'just-in-case' steps I had talked myself into humping way more than I would ever need.

A lighter, a few lifeboat matches and a flint is about all anyone could realistically need. Perhaps a couple of mini-Bics or Peanut lighters. They are both so small and light I wouldn't feel bad about carrying a spare.

Redundancy is good but it comes at a high cost. A fact that only becomes clear when you are hot, tired and pretty much exhausted when you really could have used that extra energy. Or, on friendlier terms, when you look at the content of your pack after the fact and figure all the stuff you could have gone without. Every piece of gear increases bulk and weight. The encumbrance will be making choices for you. With more weight you move more slowly, perhaps unable to outrun a crowd, fire or flood; less sure on your feet, more prone to slipping and injury; and more fatigued, less alert and able to spot dangers.

The need to sharpen a knife has to be offset against the odds a knife will need to be sharpened in the time period your contemplating and the number of knives you have.

I have seen diamond impregnated stainless steel cards, about the size of a credit card, that look good and, after seeing them used, seem to work. They come in several grits, are light and, because they are flat, quite compact.