I had no idea what you guys were talking about with "bank line" but after checking the Internet I now know that I have been carrying around a roll for ages (about half a roll now). Even though it is useful (hence me only having half a roll left) I've always found it a pain in the ass to work with.
Usmc, I already have 2 30m bundles of 550 on my BoB but my get home bag can't take anything more, hence me wanting to keep some around my waist. Also I've, on occasion, had cord knot up on me and it seems to me that having it in the form of a belt, strap, sling etc that's easily deployable could be handy (and it's more space efficient than a bundle.