In reply to HeMa:
> Bring the half-rope and single for the multipitch. But instead of leading as doubles, have the second carry the half-rope up (butterfly-coil as rucksack) and simply lead on the single. >
I'd thought of that possibility if the second isn't carrying a sack anyway, depends how long the route is I suppose.
> The rope trick mentioned earlier also works with the half rope (so no need to lug the extra 10m or so cord), provided the route is not too overhanging or traversing (so you can clean it)... also if the route is tightly bolted, the knot might snag. >
Yes, I suppose if you were making a 40m abseil for example you could ab as far as the end of the short rope, lock off, pull up the remainder of your rope with your spare rope tied to it and tie the spare into the short end of your abseil rope. In theory I suppose you could climb a 60m pitch, pull up your entire rope (so its not going through your extender krabs), drop it back down, pull up your spare rope and and abseil off doubles. A lot of faff though!
> So best bring a few old krabs as well. In which case you simply clip to a bolt, pull the rope through and leave the leaver-biner to the bolt and continue being lowered (normal protocal, 'cept for the biner on long routes with multiple anchors per pitch). >
Again, I'd thought of that but it does mean lowering off a single bolt.
Thanks for the input.