When you need a pack that can carry anything from a weekend's essentials to the office commute, I have found nothing better than Cyclesmith's packs. Sure messengers and large volume commuters may like the roomier bags, but this one has worked for me. The only thing that has worn out is the bungie cable on the outside where I used to sometimes strap down my jacket. The powerbar just happened to be in my pack as I forgot to eat it for breakfast, but a little fuel comes in handy sometimes. Carrying keys in the pack keeps them from stabbing you in your pocket if you have an untimely wreck. PDA's are bringing the desktop to a whole new range of applications including our company Enernet's professional lighting survey tools! Care should be taken to pokete the LED tail light so that it does not accidentally go on and burn out the batteries. My cell phone also resides in this pack most of the time.