BeyzaCases' new Zero Series of slim leather sleeves and pouches is said to be the world's thinnest genuine leather sleeves and pouches ever made. The Zero Series for the iPhone 4 looks very similar to BeyzaCases' more padded SlimLine Stripes pouch for the iPhone 4 which I reviewed and loved last year. The new Zero Series will be available for the iPhone 4, iPod Touch 4G, iPad 2 and the 11" MacBook Air in various colors, and are priced at €24.95 ($35), €24.95 ($35), €54.95 ($79) and €69.95 ($100), respectively. The Zero Series of leather sleeves and pouches are now available for pre-order and will start to ship on May 31.