After months of debating and searching I finally went ahead and got the joe rocket mantra tank bag. This is a great bag if you are looking for a small bag with room to carry around a few extra items. I can fit my rain suit, cell phone, mp3 player and some other small odds and ins in the bag with no problem. Doesn't slide around at all. Small enough to carry around with no problem when you get to your destination also. So if you are looking for a small bag for a day trip/overnight trip this one will do this trick as long as you are packing light (change of clothes and a toothbrush). Just thought I'd pass this along since I was having such a hard time trying to decide if it was worth it or not.