If you regularly travel with a portable hard drive, you'll want to check this out. It's the WD Nomad, a $30 case designed to protect Western Digital's line of My Passport portable hard drives from 7-foot drops, dust, and moisture. The polycarbonate shell shields your hard drive while a shock-absorbing elastomer cushion inside keeps it snug, and a heavy-duty latch and silicon liner seals the whole thing up.
What's also nice about this case is that once your drive is inside, there's little reason to open it up again. There's an opening for connecting a USB cable and an exterior ring for attaching a carabiner, cable, or strap to secure it to a bag.
The WD Nomad rugged case is compatible with My Passport drives including My Passport Essential, My Passport Essential SE, My Passport Elite, My Passport for Mac, and My Passport SE for Mac. I really wish I had one of these a year ago when I dropped my portable drive causing irreparable damage and costing me 250GB of photos, videos, and documents as well as the purchase price of a new drive.