Structured. Same dimensions as a kifaru medium belt pouch. They will hold 35 feet of resctech with hitches and carabiners but not much room left after that. If you want to carry a rappel rope and use bigger or stiffer rope, I would have him make them a little larger. I am going to try to tallk him into building what we have been discussing.Nice rig @BTaylor, are those the structured our unstructured pouches from CGM?