In reply to wildspaces:
Thanks very much. I had already read your original review.
Biggest importance is excellent weight transfer from back to hips, to protect my knackered lumbar discs. Have been using Karrimor Boma (now for sale in Classified section) for years, which has been great at weight transfer, but it is now too heavy (2,5kg and 45 litre capacity)for my needs as I don't haul so much weight any more.