White line-drawn technical schematics of steam locomotives, railway cars, and mechanical components fill a solid black ground, arranged in a classic patent diagram layout with numbered detail callouts and labels. The stark monochromatic contrast and precise engineering drawings evoke the industrial precision of early 20th-century patent documentation, capturing the mechanical complexity of railroad innovation. Sewn from a durable canvas-like exterior with a soft lining and made to order, in three sizes up to one that fits a tablet. A catchall for toiletries, art supplies, or small electronics, carrying an independent artist's work instead of a plain zip bag.