Mad Cow Metal Works is a Bozeman, Montana-based company that specializes in panniers, raft frames, aluminum dry boxes, and custom aluminum welding and fabrication for the boating, recreation, and outfitting industries. Mad Cow aluminum dry boxes are the strongest, most resilient dry boxes available because they are made of.100 inch aluminum, which is lightweight and water resistant. Our durable dry boxes come with full-length hinges, rubber gaskets, and sturdy can-jar closures to resist decades of usage and abuse. We also offer bear boxes with locking latches that are IGBC certified. You will never purchase another dry box after this one, thanks to its exquisite craftsmanship and showroom appearance.