I like the other small Topeak ( http://www.topeak.com/products/Bags/..._Handlebar_Bag ) when I travel. I move my Garmin up onto the bar extender of the clip so that frees up the handle bars for me.

The bag is just the right size for my camera (I have larger camera), my wallet and some snacks. I've used the fanny belt, but I found a light camera bag shoulder strap and attached it to the side loops.

I'm surprised at the number of "oooh, I gotta get one of those" statements i get about that bag. It is just the right size, comes on and off easily, and carries well when you're off bike.

Looks the the bag you've linked to has the same clip attachment to the handlebars. It should work just as well--perhaps a bit more durable.