A laptop daypack for commuting to work or school. It has all the things an undergrad (or a consultant) would need: laptop compartment, and space to hold your notebooks and stationery. Holds your laptop (up to a 17-inch Macbook Pro).
Comfortable to ride with, and easily stashes away under your desk at work.
A good utilitarian size without being big or bulky. Plus it’s waterproof. Enjoy the rain, and don’t worry about the stuff in the bag getting ruined.