I have a timbuk2 bag and don't really like it. Along with the comfortable factor, it has a loop that hangs to the right of you that just know one day a headlight will grab it and rip me off my bike, and the edges are exposed so water can get in there. And just not comfortable, you have to make it very tight, and the additional strap holder is able to slide along the main strap, so it slowly moves up and the bag shifts to the right. Was thinking of sewing the extra strap holder directly to the main strap to stop that, but need to find a sewing machine.

Yesterday, just for testing I dug out an old eastpack backpack and used that. Much better. I didn't think about the bag or have to readjust it even once. I just need something slightly bigger, with more pockets. It only has the main one and the smaller one near the bottom. My usual load consists of ulock, lunch, sweatshirt, a drink, cell phone, wallet, and keys, and a few other small items like earphones, usb cable, blink link, allen keys, etc. Being able to fit all that, with the option to add an additional clothing item when needed would be perfect.

http://www.rei.com/product/780465

This one looks pretty cool. Something along the lines of that.

Thanks.