I bought a Rapid Transit Shrapnel backpack a year ago and I must admit it has been the best backpack I have ever bought. I use my bicycle or motorcycle to commute depending on the errands and how many places I need to go determines which mode of transportation I will select in the morning. Even though my mode of transportation may vary my backpack remains the same, I load this pack with my laptop and all other essentials, it has big side pockets for large water bottles, location for my celphone for music, and many other amenities to accommodate the commuter. Anyways, here is where I bought it and they provide superb customer service and delivery.

http://www.revzilla.com/product/rapi...aptop-backpack