I picked up an Outdoor Products Skyline 8.0 backpack from Walmart. Originally, I got it because it was on sale and it looked decent. I threw it in my closet to use as a loaner.

I just tried it out yesterday. It's actually really nice for a day pack. I tried running with it, and it rode well. The waste strap distribute some weight onto the hips. Also, there's a removable aluminum frame that I just discovered.