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 Case 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.