Just like Sleeve, Sling is made out of 100% PET fabric—that is to say, recycled plastic bottles. Measuring in at about 11” tall and 9” wide, its front flap is held shut with the same kind of embedded magnets as the sleeve. Gone, however, is the metal buckle that didn’t offer much more than a nice accent. We did find the magnets to be somewhat problematic, however: they have a tendency to automatically unlock the iPad’s…