Approx 1500 cubic inches. 8oz, 9oz or 10oz depending on hip belt configuration. I think the weight would be around 6 oz if one trimmed the straps and wanted to remove the load lifters and sternum strap.
Never used in the field...or woods. Only worn around the house.
Chris Zimmer has built a legendary status on BPL with his packs. To read about this particular beauty, and see photos that I posted, visit this link: http://www.backpackinglight.com/cgi-bin ... d_id=55935
The pack can also be seen on Zimmer's site here: http://www.zimmerbuilt.com/exposure-pack.html
$150 shipped anywhere in the Continental U.S. Paypal only.****EDITED
to reduce price and clarification