I own a zpacks sleeping bag. It came with a CF sack. I recently lucked into an Exped SynMat and it comes with the Shnozzle PumpBag. When I was watching the video on their site it mentions that it's actually a "dry bag." So I ditched my CF bag and my trash compactor bag and put my sleeping bag and all my clothes in the pumpbag. Makes sense to me. Am I wrong?