In reply to anon1234:
Check out decathlon. They make some really nice Quechua crag sacks which have gear loops on the inside to organise your kit and has plenty of space inside for harness, helmet, flask etc. It comes with a rope bag inside but can be used separately if you want. The best thing about it is that it's dead cheap. I've had mine for about 3 years now, i use it on almost a daily basis and it's still going strong.