I decided I needed a new backpack for commuting because my old North Face pack was just too big for my body. I went to Hudson Trail (our local outdoor store) and explained that I needed something smaller for biking commuting and got this:

So far, this seems to be the perfect commuting backpack for me. Light, large enough for some papers and a change of clothes, and a nice hip belt with a side pouch to keep my fare card and phone. The best part is that it comes with a built-in pack cover for when you get caught in the rain. Sweet....