I recently picked up the hikelite 26 for $75 for my 9 km commute (I shower at work). If you need a larger backpack for more stuff, you better get panniers since the weight up high will bother you.
This one has the mesh panel and is super light (0.74kg). You really want the mesh panel to keep some air between your back and the bag. Trust me on that. Cheaper ones have am "airflow" padding with many small holes in them.... trust me, you want the mesh panel.
It also is my hiking pack, BTW.