A bookbag should carry all the essentials you need to take to class: Pens/pencils, notebooks, textbooks, and your laptop (for taking notes, of course...). This concept allows for a protective plastic cover for your valuable laptop and also has a place where pens and pencils can easily/quickly be accessible.
The middle section is designated for your textbooks/notebooks; the zipper opens up 3/4 of the way down to keep an over stuffed bookbag from spilling its contents all over the lecture hall floor.
The overall design is basic, but allows the freedom for Timbuk2 to put their personal touch on this bag.
Skeching: 25 min
Clean-up: 15 min
Shading: 5 min