I used the Topeak bag that Kano recommended on my self-supported tour last summer. The mount is great so you can quickly pop it off the bar when you want to go into a shop or restaurant or at the end of the day. And I used the handle to hold my map. Oh, and it has a rain cover which is great if it rains. Loved it! It's just big enough for essentials you want east access to, but not so big that you're tempted to overload it (which will affect your steering ability).