Printed with the nostalgic "Airmail / Par Avion" border, the Airmail Mighty Wallet is our cornerstone wallet design. The Mighty Wallet is tear-resistant, water-resistant, expandable and recyclable. Made from Tyvek (think express mail envelopes), these cool wallets resist tearing because of thousands of interlocking plastic fibers spun in random patterns, giving them incredible strength. The ingenious origami construction and stitch less design reinforces the materials own strength and allows these very slim wallets to instantly expand and adapt to your own personal storage needs. Open dimension: W: 8" H: 3.25".