Alternatives to Waterproof D-ring Shackles for Luggage

No shackle is waterproof. What the label usually means is a coating that resists rust: galvanizing, powder coat or chromoly steel that survives rain, road spray and boat ramps without seizing. And the luggage half of the question matters too: the D-rings that hold luggage, cargo straps and tie-downs are the same forged shape as