In reply to duncan:
> I'm a bit puzzled by some of the suggestions you've received, which seem a little over-cautious for a 5-10 pitch rock route in benign conditions. I'd usually follow Chris Craggs' advice and not bother with a bag at all.
+1
To the OP: Go light and try and make sure every item you are carrying has more than one use.
When I climbed in Morroco I only carried sacks up one route (Lion's Face) and that was because the decent didn't go back to the base of the route.
In an area with benign weather (ie Morocco) I would carry the following between two:
-Pair of lightweight approach shoes each - Fell running shoes are normally much lighter and better for descending grass. But I would wear 5.10 Guide Tennies somewhere rocky like Yosemite. If the climbing is well within your grade and a descent straight forward consider wearing big comfy rockshoes with sock and walking off wearing them.
-2 750ml water bottles (Don't share one bottle between two, as your partner might drink all your water!) Also clove hitch a small loop for 3mm cord round the top of the bottle so you can clip a krab to it if necessary. Maybe take twice as much water if you are in a very hot place (Yosemite) and your route is in the sun.
- a bag of sweets and a choc bar/flap jack each.
- a 2 metre length of 5mm cord and old krab. This is to clip the bag in at stances and can be used as abseil tat. (both of your chalk bags should also be carried on tat and if you need to make more than 3 abseils in a row (on your own gear) to get down you'll have to suck it up and ditch some rack. It is always worth having a few older slings/krabs on your rack that you don't mind leaving.
If it is late in the day/year take a head torch each.
If it is cold take a thin hat and a pair of thin leather plamed gloves each. The gloves should have a loop on them so you can clip them to your harness.
If you are somewhere where there is a chance of bad weather (Yosemite, The Alps, Lofoten, Dolomites) take a very light waterproof smock each. This can double as a windshirt and should fold into a pocket and clip to the back of your harness.
Dress light. On long alpine rock routes I normally wear a long sleeved thermal and a thin stretchy fleece. If it is very cold I might take a lightweight vest (Rab VR Lite is good). If you are carrying a waterproof you don't need a windshirt as well. That expensive softshell jacket looks great in the pub, but I bet it weighs a ton and is bulky if it gets hot and you have to take it off.
Ronhills look hideous, but are cheap light and good to climb in. Powerstretch tights are a good option if it is colder. I normally wear a pair of thin softshell trousers. Make sure you get a pair with a topo pocket.
If you are somewhere where there is a real chance of spending the night out. I
might consider taking a small bothy bag. The one I have is the size of a chalk bag. If it was an bigger I wouldn't bother.
Don't take the guide book. Photo copy and laminate two copies of the routes
topo instead. That way you have one each so you can discuss your navigational errors 50m apart! Make sure you have a topo with the descent on too!
First Aid/emergencies.
Half used roll of finger tape, strips of ibuprofen and paracetamol. Mobile phone if I'm in a country where it works/have one.
Luxury items
Camera each. Get a small one that takes good pics like a Canon S100.
This should all fit into a a small 15 litre bag like the REI Flash. Though I would clip the gloves and waterproof to the back of my harness so they are always there if the weather turns.
As I've got plenty of time on my hands at the moment I might write a blog post on the subject.
HTH