15.5” W x 15” H x 7.5” D. 600D Polyester and Mesh. Adjustable and padded single strap with mesh cell phone/MP3 pocket. Top carry handle. Padded back. Triangular shaped main compartment. Grommet holes for headphone wires. Front triangle shaped zippered opening. Side mesh pocket. Perfect for day trips. TR PP PS – 3” W x 3” H (front).