I actually bought one very similar to all of those posted. I hated it. It leaned when loaded and looked like crap. It was also not waterproof in itself but had a cover built in that could be used if it rained (considering you were there when it started raining or planned ahead). The bag is also not secure meaning that anyone could come along and take whatever was there for the taking. This leaves the option of taking the bag off and carrying it with you where ever you go. The idea of lugging my stuff around when I am away from my bicycle (emergency supplies, headlight, GPS, and anything else I carry when I am out for a ride) is just limiting in my book. So once again I look for something that is hard to find or doesn't exist yet. I am really leaning toward this: http://www.stonecoldoutdoor.com/catalog.php?cat_ref=6 It doesn't come with mounting equipment so you will have to come up with something on your own. If I get this, I will post what I come up with. It is limited in space but it is water tight and lockable. I like it. What are your thought?