Here in South Florida photographers have been using soft sided coolers for about a decade now to stow their cameras. They take up about the same amount of space as the rigs themselves, prevent the cameras from sliding around a slippery deck in rough seas, keep them from banging into other items, and also serve as rinse tanks after the dives. This is particularly nice in that you get to soak you valuable rig in clean water and avoid communal rinse tanks that may have already been used to rinse masks with de-fog, booties, wetsuits, mucus laden regulators, and various other unpleasant articles.