These containers are very durable and I enjoyed that I bought so many at one time because they're useful with so many items in your house or parties. They may be called Jell-O shot cups, but they're really all purpose. Finally the top or lid really stays on well these containers are very durable and I enjoyed that I bought so many at one time because they're useful with so many items in your house. They may be called Jell-O shot cups, but they're really all purpose. Finally the top or lid really stays on well. I am not sure if it's waterproof though. I am not sure if it's waterproof though, but definitely seepage resistent. Great for parties, favors and candy SNACKS. I use them for sauce on the side for my mom who is picky.