In reply to blackreaver: I have mixed views on this. You need to think about where you will be climbing. I have a DMM rucksack style one which is fine but with the sheet extended it is not possible to zip up the bag fully to keep the contents secured and if I am honest it does not make that good a rucksack. Most sport climbing is easy access and I find that a separate bag for the rope and a rucksack for the rest of the gear is usually more convenient. I like the BD rope bag as it is simple, light and doubles as a rope bucket if necessary so I'm seriously thinking of getting one of those. Go for the Ikea if you are a skinflint, not sure if you could carry that over a shoulder though???.
Al