If you want a case and not just a cover for your iPhone 5: The Vaultskin is an extremely beautiful, kid-glove leather case that looks and feels absolutely great on your iPhone 5.
The case measures 5" x 2.5" and snaps on securely.
Don't be mistaken--this case will NOT protect your phone in case it falls. But, if you're careful or you keep your phone inside of a bag or pocket, this case may be sufficient.
Because this is a case that doubles as a credit card holder, it's impractical to put it in an Otterbox-type case.
Speaking of cards, the company says it can hold upto 8 cards, but I fit only 5 cards in it comfortably.
The price is around $40 and for the quality of this case, I find it accurate.