I looked at a lot of bags before settling on that one, I'm glad to hear it looks ok.
I also use a fanny pack, the
Inov-8 Race Pro 4, which I love. I've held 48oz of water in it but I would rather put the water in a backpack or frame bag, as it's not the most comfortable. With no water, it's a dream. I cannot recommend it highly enough.
Anyways, the tentative plan is to wear both at the same time, since I already wear the Inov-8 low, on my hips, and the bag should be cinched up tight if I'm wearing it. Of course, if I can strap it to the frame in some reasonable fashion, i'll be doing that. I do want to have quick access to it for snack breaks or water breaks, and for that, my back might be the best place.