Vintage patent diagrams for firefighting equipment fill this composition, rendered in detailed black line work against a clean white ground. Helmets, axes, ladders, hoses, and mechanical apparatus are arranged in a technical schematic style, evoking early 20th century industrial documentation with scholarly precision and historical authority. Built from double-wall stainless steel and made to order, holding 20 ounces with a snap-on lid, a standard-cup-holder fit, and wraparound artwork. Your commute carrying original art instead of another branded tumbler.