Bullfrog Carrier Bag from Brooklyn Industries: http://www.brooklynindustries.com/index.cfm/fuseaction/product.detail/_/Carrier-Bullfrog-Bag/productID/1d65fbb4-a

Bullfrog Carrier Bag from Brooklyn Industries: http://www.brooklynindustries.com/index.cfm/fuseaction/product.detail/_/Carrier-Bullfrog-Bag/productID/1d65fbb4-a282-46ff-8780-1bf06a0c903f/categoryID/eb161d31-fcfb-4d00-bdb6-8addacd9e584?productOptionIDs=9fc8413d-035b-42b9-8c05-202af4ba70dd http://www.brooklynindustries.com/index.cfm/fuseaction/produ... Every day for the last 4 years, I've carried a Thinkpad around NYC in this thing. It quickly converts between two different configurations: (a) comfortable and back-friendly double backpack strap and (b) a more professional-looking single shoulder strap. Has a padded laptop compartment, a main compartment, and two big external pockets. Only complaint is the latches are plastic and have finally started to break. I love this backpack enough though that I'll probably take it to the tailors.