Tyvek is a synthetic material made from high-density polyethylene fibers. It’s super lightweight, durable, water-resistant, and tear-resistant... which makes it incredibly versatile. It looks and feels like paper but performs more like fabric. The interior’s lined with soft cotton and built with four pockets to keep your essentials organized. Roll the top and seal it with Velcro to close. From the outside, it’s all low-key. On the inside, it’s all function. Keep 'em guessing.