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Barbers hone easily competes with the Norton 8k and will keep a razor sharp indefinately, as far as hanging strops go you can easily keep one in an airtight cylinder(pvc pipe with caps) or something...

Why not a barbers hone, for the occasional touch up, they are readily available and inexpensive. Usually measuring around 2x5 inches and 1/2 inch thick, they will easily travel in a rucksack, as will...