Handling characteristics, shock absorbtion, and "knotability" are important factors as well. The spectra cordage I have used, and it definitely has its uses, does not compare well at all in these characteristics with materials used for protection in a climbing situation, most of which are one or another form of nylon. If there is the potential for the use of a climbing rope, it is best to add one to the kit. If you need any rope at all, you will most likely need a lot of it - at least 50-60 feet.