Rooftop cargo box. Large -- it came off of a mini van but we used it on an SUV sport. We got a lot of use out of this cargo box but we don't do that kind of camping anymore. Plenty of life left in it. Opens on both sides with a single key. You need a roof rack and cross bars. I'm pretty sure I have all the hardware you need to attach it but if not you can buy what's missing.
Pick up in downtown Bethesda. Preference to someone who can get it ASAP -- before I change my mind.