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One real advantage is that a metal carabiner will rattle against a metal mug. Build the carabiner into the handle and that can't happen. This rattling may be simply annoying most of the time, but...
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One real advantage is that a metal carabiner will rattle against a metal mug. Build the carabiner into the handle and that can't happen. This rattling may be simply annoying most of the time, but...