The Sportsack is a must have accessory to keep your hands and disc dry while maintaining a consistent grip. Simply roll the bag around in your hands for a few seconds to soak up any moisture and oil to restore your natural grip. Each 100% cotton bag is filled with clay fill for added grip. The Sportsack does not leave behind a chalky dust or messy residue and lasts much longer than rosin bags or other powder based products. Comes packaged in a zip lock plastic bag for storage. If sack becomes wet, continue to use and will dry itself out.