Just looked up the numbers on the web and water weighs 63 lbs. per cubic ft. As I have 1.65 cubic ft. of water in the reservoir (104 lbs) and I estimate the potting mix with moisture control is absorbing another 20 lbs. or more of water, anyone who has a concern about these things tipping over in a windstorm has little to worry about. The vines with their tomatoes will wind up with Dorothy in OZ before the containers will ever move..
Ray