James W.wrote a review of Granite Gear Air Compressor Sack on June 3, 2013
Great compression sack. the rectangular shape fits the pack better than round. it is super light weight and the cords and the walls of the sack are very durable. A little pricey, but a great piece of gear. I bought the medium at first,but returned them for the large (23L) which fills the pack better.