I purchased this waterproof case for my Samsung Galaxy S7 as I do a lot of photography near water and like to be assured that it's safe if I was to accidentally drop it in a lake/river/pond/etc. I tested the product in a sink full of water before use as stated in the instructions and it did not leak. This is a great idea and comes with a lanyard which I can keep around my neck for convenience.
My phone fits inside perfect with an armoured case on. The two locking tabs allows me to take my phone out or put it in the waterproof case with ease and quickly.