My 2011 came with both units. I removed ski bag and installed shelves, I liked the novelty of having an option but that made the interior louder without the ski bag acting as sound insulation.....roof up of course. I switched back to ski bag. I could be remembering the sound level issue wrong, as I once removed both options for a road trip and just had open access behind the interior door to access small cooler/snacks/rum.
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