Show off your mathematical prowess with this shoulder tote that celebrates some of the great equations that changed the world. Use it to carry your TI-89, a notebook for impromptu proofs, your favorite math text and a draft of your dissertation.

This sturdy canvas bag is reversible with a zipper pocket in a soft grey on one side, or you can flip it around and wear it with the printed Equations That Changed the World design on the outside for everyone to see.