The Topeak Aero comes with straps as well as the clip. If the straps aren't a problem for you, it is going to be more reliable. DH's clip broke on the last ride. We already had jacket stuffed in our jersey pockets. From that point on he rode home with the contents in his pockets and I got to stuff the bag into my pocket. I think I'm a firm believer of clipping with cloth or leather now.....much easier to see the wear.

But, I like the Topeak bags, otherwise. Also, despite my slowness of non-speed, love my Bento box--hope you can figure out a way to mount one on that gorgeous frame.