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The point is that you can have a second razor sharp blade at hand in the bush ready to go without having to carry a second knife. Just swap them out and sharpen when you get home.

You can sharpen the blades, so they don't have to be disposable.

I've just got a knife with replaceable blades. It's not pretty or traditional, but think it's going to be very useful in some circumstances. I've used it on a couple of animals and function is as...