Discount for The SealLine HP Map Case features a new secure roll down closure, so you never have soggy contours. Super-durable PVC-free material. Secure roll down closer prevents any water from ingressing. Adjustable neck strap. The SealLine HP Map Case features a new secure roll down closure, so you never have soggy contours. Super-durable PVC-free material. Secure roll down closer prevents any water from ingressing. Adjustable neck strap.