If you travel light, you can take an (iPhone) Hint
The iPhone Hint (http://www.sfbags.com/products/iphone-cases/hint-iphone.php) is cute, inexpensive (US$25) and useful for many folks I'm sure. I'm just not one of them.
If you head out and all you need is your Apple smartphone plus a couple of bills and maybe a license or credit card, the Waterfield Design case may fit you like a comfortable glove. You can slip the aforementioned items into the iPhone Hint and be on your way.
But if, like me, you have to pack your iPhone, a credit card, insurance cards, movie theater discount cards, book store discount card, a Kroger card, etc., the Hint just isn't roomy enough. (Alas, it's not an overabundance of money that's taking up all the room.) I'll have to stick with my wallet and U-Suit Premium Executive Director (my iPhone case of choice).
The iPhone Hint comes in your choice of black or brown, naturally-tanned leather. A front window lets you both see and use your iPhone, so there's never a need to guess who just texted or called. The iPhone Hint fits the iPhone 4S and iPhone 4 (without the Bumper).
For those who travel light: 10 out of 10
For those who don't travel light: 2 out of 10