Quest Quick Release Clip-On Expandable Seat Bag Black
The Quest Expandable Bag features an expanding pocket. This allows enough room to store a tube, tools, food and more. The quick release buckle mount attaches securely to saddle rails. Made from tough 600D nylon, polyester and formed Eva molding adds the reliability needed to secure trail side necessities.
The first ride I went on with this, the bag ripped, unfortunately. I don't know if it is a design flaw or just an anomaly, but if you are planning to do vigorous downhill, then I would be careful with this bag.
Just tried this out, but it seems very good so far. Easy to install clip, keeps bag in place very well. It is large, but still does not stick out from under the sides of my saddle. I tend to take long rides, so I appreciate being able to fit two tubes and a variety of tools.
Very large saddle bag if you need a large one try it, to big for me.