Abstract: A secure barless cover for cargo container portal/opening consisting of flexible, durable, lightweight, weatherproof fabric sized to correspond with the opening, permanently secured across the top edge of opening and incorporating a single, continuous loop cable in conjunction with simple hooks and a single point cable tensioning assembly to secure the cover to the top, bottom and side edges of the container opening. The cover is fitted with grommets and cable pockets along the bottom and sides to allow the cable to weave through the cover from front to back. Continuous looping of the cable is created via use of a cable clamp that enables length adjustment and is secured in place after the cable has been woven through the cover grommets and pockets, hooks and tensioning assembly. Cable exposure to the cover's front is minimal, to allow hooks to hang in easily accessible, strategic positions for attachment to the container opening bottom and sides when securing the cover to the container.