Looks like those Macbook Air ad-makers inspired more than one designer's quest to create the perfect Air laptop sleeve. Michael Leung's Mac bag lightly touches upon the classic manila envelope, retaining a simple, modern bag-like feel. Wonder Threads, on the other hand, took the campy, photorealistic route with the appropriately-named Macbook Air Laptop Sleeve, made of poly-microfiber with a fuzzy neoprene lining.
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Hey now...there's also Airmail by Jona Bechtolt and Claire L. Evans: