Sold in five different colors, Beyzacases' Zero Series Case (€55/$73) is a relatively simple iPad sleeve that emphasizes slender sizing and high-quality leather as assets. So tightly tailored that a third-generation iPad with screen protection feels snug inside, Zero Series uses floater-style leather with distinctive contrast stitching down the center. There's no "eject" mechanism for the iPad, so you need to tug it out of the case's center…