I like the Carradice Super C that I have. Its light, has a great map case, a nice shoulder strap, and a zippered pocket inside the main compartment to keep money and other valuables in. It uses a Klickfix mount and is easy to get on and off the bike. I also have a large Arkel handlebar bag, but it is heavy and I find that is inconvenient to carry off the bike due to its large size and boxy shape.