These are as described and not water proof. I have not tried using Glad Press N Seal, yet. They have held up and don't feel flimsy. They are definitely not take and toss, but since they were inexpensive, I won't be upset if it gets lost at school. I have washed them on the top and bottom rack of the dishwasher, but NOT on sanitary cycle. I do use heated dry. They did not melt or warp. We received green, blue, red, and orange lids. My children are 3 and 6 and were able to open them by themselves. The containers and lids nest neatly and I store them in the insulated carrier we bought separately. I contemplated PlanetBox and this was a more economical alternative.