I'm using a Chrome Citizen for my commuting. Very happy with it! Built to last and stays in place. I carry my work clothes, bike accesories (tubes, co2, lights, tools, etc.),and maybe a rain jacket. Have plenty of room left over, but I don't carry a laptop, though I'm sure I could fit one as long as I keep a pair of shoes at work. My commute is 17 miles round-trip.