The tough water-resistant fabric and self-repairing, corrosion resistant zippers. 600 denier polyester and reflective exterior/210 denier polyester interior. Shoulder straps transform into two 4′ leashes to tether survivors together. Buoyancy: 15 lbs. dead weight with bag flooded in fresh water. Exterior Storage Compartments: EPIRB pocket/mess compartments/1 strobe light attachment/1 clear compartment. Interior Storage Compartments: 3 enclosed side wall pockets/2 daisy chain organizers/12 slip rings. Dimensions: 21″ x 6″ x 14.5″.