In reply to holly Sidney:
I've got an old and basic POD rope bag which is very good in its simplicity to be honest. I also have one of the long Black Diamond ones which are a bit counter-intuitive and I've never been very keen on it for a number of reasons.
I was given the Metolius Ropemaster for Xmas by some kind soul and it does seem rather excellent. I'm always torn between getting one which you can wear like a ruc sac and one with just a shoulder strap but if you normally carry a rucsac anyway, the single shoulder strap variant must be better.