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The ergonomic part, was using one in the bush for a week.
Now I've got a small WW2 Higonokami, it's as bad for the hands as the Douk Douk, guess I'll never learn!

Please don't mention the "Douk Douk", my hands hurts just as I hear that name.
Should still have both a Douk Douk and an Opinel somewhere in my mess.