http://www.digideep.com/english/underwater/photo/housing/Aquapac/Digital-Camera-Case/5/303

That Aquapac should work as it worked with the 4040, which I believe are identical just about in size ?

Remember though that may say 5m and the others may seem like over kill .. the more they cost the better quality as well, so they will probably last longer and protect the camera better.

Even snorkelling the last thing you want is a leak. And on the surface a leak is more likely to happen as there is less pressure to squash the seals together.