I have a bunch of those in several sizes and styles I use for long term storage, of well, junk I should probably just get rid of, and camping gear. They are great for that, they close solidly and stack nice.
They are not real thick walled or rigid, maybe a shave more than typical totes. Any extra strength comes from the structural design of the edges not from additional wall thickness.
I don't keep them out in the elements of course so no opinion there. I do use a few for camping but I keep them inside the vehicle when I'm moving.
I say give them a try, if they take on water too bad, use them around the house to organize your crap.
I will say the way the lid is made, it won't be super easy for water to get in unless the airflow directs it upwards into the lid area.
If you are putting them in a truck bed where water is not forced onto them while moving, I think they would stay dry enough, but I'd still bag anything inside you really didn't want to get damp.
