Click here to Buy it Now from LifeProof, $80

You won't be able to tell from looking at it, but the LifeProof case is one of the most rugged and durable cases you can currently buy. Hence the crazy price tag. Despite it's thin and light (weighs less than ounce) form, the LifeProof case has a full IP-68 rating meaning your phone will be completely dust-proof and will be able to survive being immersed in water deeper than 1 meter. It also meets military-grade specifications for shock and impact.