I keep 550 cord and 60' of 24lb spiderwire in my kit. As for the flat rope, you can get some 1/2" wide stuff that is 2500 lb test from electrical supply houses. They call it smud tape, and it has no lube. I used to keep 50' in my kit. To me the drawbacks were that it liked to roll one edge to the other, frays easily in use, and could be torn like tape across a flat edge, though with much more force. You could tie specialty knots around pipes, metal poles, etc. with it, and it would grip them well.