carry really fine steel wool for use as tinder. even soaking wet, just wring it out and it lights fast; it will rust, so rotate it if you have it in a bugout kit.
a piece of nylon stocking over the primary filter of your water intake (katadyn style filters) will extend life of filter.
to fix minor scratches in glass lenses, use some lipstick or tooth paste. Both are very fine abrasives and will take the scratch out without "fuzzing" the glass lense. Lipstick is commonly used as the final polishing agent on home made telescope optics.
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