Comments about Otter S3 Water Tight Dive Flag Box:
LeisurePro reps indicated that box is watertight to at least 100 ft, however I had it leak a bit (but not flood) on dives to 40 ft, so don't put anything inside that needs to stay absolutely dry. The top half of the case is a bit warped, so the seal is not tight all the way around. Also, you may need to use a knife or screwdriver to pry it open after flying or diving due to reduced pressure inside. On the plus side, it's durable and did not crush on a dive to 100 ft.