+1000 on the Seagull. I have a Large Black and use it daily for everything, not just cycling. For my commute, it usually carries a change of clothes, my laptop, a pair of shoes, lunch, coffee cup, water cup, tool bag, and cleanup kit (wipes, deodorant, body spray). Now my wife owns one that she uses as her purse, both of my kids have one that they use for school. Great product, and great people running the company.