Nylon or Airform Portable Western Digital Passport WD Portable Carrying Case for all Passport - My Passport Essential - WD Elements fits all sizes 80GB 160G 250GB 320GB 500GB with Clip - 13 Color Choices (Hard Drive NOT included!!)
From the pictures online, it looks like this is a hardcase item.  It's not, this works for keeping the storage device from getting dust on it, but I wouldn't risk dropping the carrying case with the Passport in it!  I do like the design of the case.