"The Banyan Ridgeline Shelf Organizer is fully adjustable along your dual ridgeline. It provides a nice size shelf and pockets that holds items you need accessible. The two open ends have a sewn channel with shock cord allowing you to tighten any loose fabric, keeping your items on the shelf where they need to be. We use black mesh allowing you to see exactly where you placed your gear."
 
The above wording is straight from Dutchwares' Team.