Well-constructed, light, and at a good price
The case is very light, yet strong and rigid enough for light/casual use (i.e., I'm not putting it in bags full of heavy books or camping gear).  The zipper opens very smoothly, requiring very little force, allowing me to open and close the case one-handed using my thumb to work the zipper.  (Of course, if you, unlike me, have the foresight to put your sunglasses on BEFORE you start driving, this will probably be kind of a moot point.)
Rating: 5 stars