Shot in the dark question... I am taking a bicycle tour soon. 14 days. Some days will be 50+ miles. On nice days, I'd like to carry my good camera with me, instead of just shoving my p&s in my pocket (which I will if rain is threatening). I am looking for a seat bag. Something that goes directly under the saddle. No handlebar bags or pannieres. Has anyone ever done this? What bag did you use? Thanks!