sewp16151 wrote an answer about Stoic Fusion Dry Compression Sack on September 6, 2012
This bag does not have a valve. It works sort of like a regular stuff sack. If you fold down the roll top portion of the sack, you'll find a draw cord that you can cinch. The compression straps are attached to this portion of the bag. So you cinch the cord tightly, then use the compression straps to compress the bag. Excess air is expelled through the top where the draw cord is. Once compressed, you then use the roll top portion of the bag which is welded to the main bag to make it water tight. It's kind of a weird method but works.