Surf To Summit The Mariner Dry Bag Backpack, Waterproof Backpack, Rolled Down Dry Bag Backpack, Hiking Backpack Waterproof dry bag constructed from durable tarpaulin Three-way, roll-down closure method Airflow, ventilated back pad system Shock cord lattice, daisy chains, and mesh pockets for external storage Measures: 9"W x 12"L x 23"H (Closed); Choose Black or yellow