What's the best waterproof cas for iPhone 5?

Everyone talks about the lifeproof fre case but I've heard that the screen bubbles, not really shock resistant, and the gasket that you screw off can get lost easily. The otter box armor is way too big and bulky. So I'm narrowing it down to the griffin survivor + catalyst or the incipio at last which seems like the one I will buy. Any thoughts? Anyone use these for extended time? What's the pros and cons? Also I know the lifeproof has the núud case out now too but I want something that actually covers the screen so I'm not interested in that case.

Last 6 months, my friend had gone to Singapore, there he used his iPhone underwater by using waterproof cover. It completely covers the phone to protect it from water. The purpose of telling you is that the cover is very slim and attractive. You can use the cover every time and anytime. But underwater some precautions is to be taken.

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