Are you an outdoor enthusiast or a fixit fan? Then consider TaskLab's TaskOne iPhone case, which comes with 22 tools, including a saw, a knife, three screwdrivers, a wrench and pliers. Now you will be able to open a beer, whittle a stick, cut metal, strip a wire or saw through a branch (among other things), all with an iPhone case.
The TaskOne for the iPhone 5/5s weighs 3.4 oz.; there's also a 3.1-oz. model for the iPhone 4/4s. The case is made of aircraft aluminum and polycarbonate while the tools are stainless steel. It currently comes in Jet Black, Slate Grey and Cherry Red, and a Camouflage version is in the works.