We're not much for sleeve-style iPhone cases, but when done right they can have some appeal. Spigen SGP's Crumena for iPhone 5 ($30) combines a clean design, nice materials, and a reasonable price. Available in black, white, or brown, the holder is made of real calf skin leather, a fact that's somewhat surprising given the price. A magnetic tab holds the iPhone in place and doubles as a way to pull it out. The sleeve is just barely tall enough for…
