I have the two bag trunk top set from Moss Motors for Miatas that I used once for sale. I no longer have an S2000, but the bags worked perfectly for a round trip from Phoenix to Denver. They work best on a trunk without the low factory spoiler, but they will also work with the spoiler. They are NOT currently available from Moss, but here's the info: Utilizing a PVC inner liner, these Touring Bags are totally water proof. The custom 8 point mounting system holds the luggage to your Miata’s trunk lid, tight and secure. Bags come with a Cordura and Evolution 4 mat to protect your trunk lid. The current listing:

http://www.mossmiata...teIndexID=36861

I don't remember what I paid for them, but they're yours for $100.00 OBO plus reasonable shipping. PayPal works for me.