How to sling Grappling Hooks?

I've seen them slung with the knot on the rock-facing side, and also on the outside. I've seen them slung with cord and with webbing. What do you guys recommend?

Knot away from rock. 9/16" webbing.

Goodhue wrote:Knot away from rock. 9/16" webbing.

Agreed. Knot away from rock (think about the direction of force upon the hook, knot away from the rock pulls the hook into the rock) 9/16th webbing, overhand knot, loop ends about and inch below the bottom of the hook. If you're worried about the loop falling out while it's in the hook bag (not really going to happen) you can tie an overhand in one strand of the webbing before pushing the free ends through the hole in the hook before tying the overhand knot in the ends that go through the hole away from the rock. (But as I said, this isn't really an issue unless you're using thin supertape) And check your overhand knot before using the hook the first time on the route!

18 inches of webbing is a good length to start with. It looks like it's going to be too much, but it probably won't be.
Like Kevin said, don't make a loop more than about 1 inch below the bottom of the hook