Underwater photography has been a fairly expensive hobby, with housings that go up into the hundreds or thousands of dollars. With the Ewa-marine bag, you can take your point and shoot into the water for $100, and your SLR for only $350.
The PVC bag is waterproof, obviously, and durable yet flexible, so you’re able to press your camera’s control buttons without too much hassle. You may not be able to adjust every setting, but as long as you have everything configured before you hit the water, you should be alright.
Product Page [Ewa-Marine via Popular Science]