In reply to segfbdsg:
I have 6x10cm, 2x20cm and 4x60cm. I generally use the 10cm ones where rope drag isn't an issue and almost always for the firts bit of gear if its near the ground. The 4x60s are carried tripled and so I can use them as 15 cm (thats about the length they come to) if I want, but I use them more as 60s whenever Im worrried about rope drag. The 20s dont get used much. One of them has a revolver on it so sometimes Ill use that to combat rope drag or a dodgy piece. Most rouets I obviously wont carry 12 draws up, and it tends to be the 10cm ones that lose out, so on a norma lroute Id have 4x60cm, 1 or 2x20cm and maybe 3x10cm, depending on how long the route is and its nature.