When I was in university, all I carried was a netbook and a small notebook. (Maybe an iPad now.) This would've been one of the bags I used if I were still in school. It's the pefect size and very convenient because it's both lightweight and durable. Although I'm no longer in school, I still use this bag when I have a lot to carry. If you bring a lunchbox to work, this will probably be a good size for you. It can also function as a cute camera bag that you can wear crossbody-style.
I've been holding this purse three ways: on the crook of my elbow, in my hands (like in the photo and on my Instagram), and on my shoulder using the shortened strap.
The bag comes in three colours (black, grey, and maroon), has both a zip and snap button closure, and has a removable strap. It's currently on sale for 35% off and you can get an additional 21% off + free shipping with the code TLDP. Happy shopping!
Update: It has come to my attention that the code might not work on sale items. Sorry guys! :(