Topeak Aero Wedge Medium Pack
The Topeak Aero Wedge Pack has aerodynamic styling and traditional strap mount for peak performance. Great for holding tubes, keys, etc., and is the perfect addition to your bike.
This is the best bag I've ever owned, it's extremely well made and made of very durable outside materials and strong enough zippers, plus it looks good. I also like this bag also because it can expand if you need more space. It secures very well to the bike and doesn't swing on hard out of the saddle sprints, plus it has a strap that you can slide a tail light clip over. Topeak did their homework on this bag and provided it at a reasonable cost. They do make a larger version of this bag if you need more space but it's not sold here that I could find.