Wow,
I am not rich, or anything and my digital Olympus let me down on the next to the last trip. It was a 3 mega pixel from last year and bulky. The camera got wet. the chip held out in the end. We got the pictures in salvage. The small dry bags that fold over do not work under any kind of pressure and all failed at some point. It was easy to find as you only had to put a paper towel in the bag and submerge it.
I replace the camera with a Walmart puchased FUJI and it was even better! the system was wrapped in a Pelican box and off to Canada! oops all the Pelican boxes I tested after the trip leaked. I lost the camera and recovered the pictures.
test your boxes!.