Aqua Tek S for iPhone 4/4S: $129.99 (includes U.S. shipping)
Back in March, the Aqua Tek S for iPhone 4/4S more than doubled its funding goal, as around 900 enthusiastic Kickstarters clammored for one (or more) of these cases. They're as power-packed, versatile and rugged as Rambo, with a built-in 2,000mAh battery, solar panel, polycarbonate exterior and rubberized side grips. They can withstand drops from -- or underwater depths of -- up to six meters. Given all that along with its temperature range -- scores of degrees Celsius cooler and warmer than iPhone can actually operate -- it's definitely the case to take on your extreme (underwater or otherwise) adventures. It's estimated to be shipping right at the end of this month.