Mophie Juice Pack Pro iPhone Case
From the Editors of Freeskier:
This powerhouse of a protective case shields your iPhone 4 or 4S from the elements. It’s engineered to exceed military standards for performance under extreme conditions. Best part? It stores power, providing your iPhone with 100 to 150 percent more battery life. This case is built for adventure yet is functional enough for everyday use.
The Cons: Bulky, heavy.