I have The One Bag by Undfind. Its a newer company so they are not super well known. I really like it because it is not bulky and perfect for carrying a few lenses, and a flash on you while you are shooting or just stepping out to wonder and take pictures. Also, you can take the photo insert out and it becomes a laptop bag. Best of all its more affordable and comes with covers to customize the look. It gets my vote.
Its similar to shootsac and lowepro messenger bags if you want more options.