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I just keep it in my pocket for easy access, out of the case. That way won't swing around, get dirty, bump into things, or get rained on (even though it is waterproof).
My binocular harness came with a little D ring with a snap on it that hooks onto my rangefinders cover. I have it clipped into position so that I can just grab it and it slides up the strap right up to my right eye. The rangefinders cover is neoprene so even if it hit my binoculars, it doesn't make any noise. Works great.