Abstract: A system for securing a worker to an elevated structure includes a flexible anchor line extendable across the structure, hooks at opposite ends of the flexible anchor line for engaging the structure, and a line storage device for releasably storing a portion of the flexible anchor line to adjust the length of line and tension the line to bring the hooks into anchoring engagement with the structure and secure the anchor line to the structure. One end of a restraining line is releasably connectable to the flexible anchor line. The opposite end of the restraining line is connected to a harness wearable by the worker. The system is a lightweight and reliable apparatus that is easily transported and operated by a worker to secure the worker to an elevated structure such as a cargo container in order to conduct work in safety.