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I have one made by CoverCraft. They come in two colors, gray and tan. They are water resistant (nothing is water-proof). The water beads up on the top and you just lift the cover near the center and the water runs right off.
Very light, compresses down to a small size and very easy to store in the center well of the C5. Also comes with it's own drawstring storage bag. Has reinforced gromets at the sides (under the car doors) to hook a locking cable.
Thought I would have to wash it when some birdpoopie got on it, but NO, it was completely dry and came right off when I wrinkled the cover underneath it, the poop just fell to the ground.
If you are going to the get together on the 9th, and it's not raining, I'll show it to you.