Moisture Munchers 1 OZ packages work really well for underwater video housings. I have a Sony HDR-XR520 video camera and use a clear Ikelite Video Housing.Camera motor heats up air in housing causing fogging of lens. Tried the smaller camera type muncher to no avail... but I tried the 1 OZ. packages and it curedmy problem. I just slide it in on top of camera when installing in housing. Works great. I get about 10 dives out of each packet if I keep housing pretty much closed up.Sealife Moisture Muncher 1 oz. Packs (Set of 3)