The finest hardware available, including massive #10 YKK zippers, welded steel D-rings, and more, Wide, unrestricted openings provide fast, easy access to contents, Interior walls lined with heavy-duty pack cloth for surface protection and smooth movement of contents. Air Cases feature Tenba's exclusive design and construction - including a patented internal framework - that offers you the shippable protection of a hard case at a fraction of the weight. Saves your back, saves your money. Over 30 sizes, virtually limitless possibilities. The industry standard for lightweight shipping cases for over 20 years. Tenba's patented Air CaseTM construction comprises a multi-layered skeleton of air-channeled plastic panels, high-density foam, and specially-molded framing components, with a heavily reinforced ballistic nylon outer shell. They are strong enough to stand on, even when empty, and are built to meet or exceed ATA shipping standards.