The Renegade X features ALPSproprietary Air Control fabric, which permits excess air from inside the stuff sack to escape during the compression process. When space is at a premium, this allows you to use the rolltop closure and side compression straps to squeeze out every last ounce of unwanted air. In addition, a coating is applied to the nylon ripstop fabric, and the seams are fully sealed, allowing this compression sack to become resistant to water. While theyadvise against full submersion, this compression sack is designed to withstand rain and splashes. The Renegade X is the perfect compression stuff sack for wet environments (not submersible).