I have a travel bag packed with scissors, rotary cutter, pins, thread, bobbins, markers, needles cutter blades,... When I go to classes, I add a cutting mat and some rulers (which ones depends on what I am making) and grab my travel iron and my traveling machine. I don't have many duplicate rulers, but I do have duplicate mats and cutters (and they reside anywhere I can find a flat surface to cut on.