For distance sailing, you can add two jam cleats on your harness (on either side of the hook)and then just run a line between the two means with a shock cord that keeps it retracted when not in use. Advantage is that it holds you both directions, easy to disconnect, not exposed hooks, and works for 2 people. I think there are some pictures of this system with Jamie Livingston on the Tybee500 report by Rick.