If you are after a bag rather than a backpack or sling I really like Billinghams Neil.
They seem to be well made and durable. I have the FibraNyte ones and have no worries about putting them down on the beach, wet grass or in muddy conditions as they wipe clean easily and they're waterproof so rain isn't a problem. Another good thing is that they don't have zips apart from when they have a back pocket. No zip means no zip sound when you open the bag in quiet places. I have three and will be taking one with me when I go to Thailand later this year. Oh, and you can take the inserts out and use them as an overnight or general bag.
Good luck choosing.