In reply to Emlyn Price:
I haven't used the Crag Wagon, but have used the BD Creek
I've got the 50l version and absolutely love it, mostly because of its ease of use. At 2kg it's far from lightweight, but the fact you can stuff everything in easily, and access it all via the side zips, means that life feels incredibly easy. I've used it whilst cragging locally and whilst climbing on sea cliffs, where the additional volume means you can stuff a static in the base without too much extra effort. I haven't used it whilst walking up to mountain crags, but I think this is just a coincidence as much as anything, as I haven't been on a mountain crag in quite a whilst due to everything that's been going on. It's got a good carry, and can handle loads really well, but is pretty heavyweight, which may or may not be to your tastes in light of that.
If you're looking for something lighter and more refined the Lowe Alpine Rogue is well worth a look, as is the Outcast, as both match your criteria. I've used both, but probably prefer the Outcast. Alan however, prefers the Rogue.
Here's a link to the relevant reviews:
Rogue: https://www.ukclimbing.com/gear/rucksacks/lowe_alpine_rogue_48-12783
Outcast: https://www.ukclimbing.com/gear/rucksacks/medium/lowe_alpine_outcast_44-127...
Hope that's of help!