Shewie - the berghaus case would probably be good for you too but aquapac do a rolltop bag specially made for cameras and stuff that is pretty water resistant (not allowed to say waterproof now without the right IPX water safety certificates). It is bright orange and think can fit to vertical and horizontal straps as well. It is not the clear ones but the orange ones which IIRC are padded.
BTW about 10 years ago a mate had the boxit phone case which were made for the standard Nokia phone shape that was pretty standard back then. He used it clipped to his bouyancy aid while whitewater kayaking. As you can imagine dropping over grade 4 or 5 waterfalls meant it got a good testing for waterproofness, toughness and secure clipability. On top of that he was able to use the phone through it too!! One time we were paddling through a gorge in the Lakes and it was amazing how he had full reception all through the trip too!!! I'd have thought it impossible to get any signal there at all!!
BTW about 10 years ago a mate had the boxit phone case which were made for the standard Nokia phone shape that was pretty standard back then. He used it clipped to his bouyancy aid while whitewater kayaking. As you can imagine dropping over grade 4 or 5 waterfalls meant it got a good testing for waterproofness, toughness and secure clipability. On top of that he was able to use the phone through it too!! One time we were paddling through a gorge in the Lakes and it was amazing how he had full reception all through the trip too!!! I'd have thought it impossible to get any signal there at all!!