I have a 75lbs vinyl TKO but it weighs about a 115lbs right now because I don't take it down but once in a great while and turn it over for a couple of days to move the stuffing around. It's rock solid down low(great for leg kicking) and if you head hunt for awhile the water starts streaming from the bottom

BTW, all of the vinyl and canvas will take on water through the zippers/ fasteners as well as from the morning dew. A hydro would probably fair better but they baby your hands,feet,wrist,ankles, and shins to much IMO.