design propulsion systems

Perfect for early morning hikes and woodland research trips

and culture -- and now this Linguistics notebook can inspire all your communication

and annotated clouds

This sturdy canvas tote bag is reversible with solid deep sea blue and a zipper pocket on one side

Equations That Changed the World Shoulder Tote Volume_18 oz | 530 mL design propulsion systemsShow off your mathematical prowess with this deep blue and gold 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 canvas bag is reversible so you can wear it with the printed design on the outside or the inside two bags in one!