So I bought a 3 pack of these Rubbermaid twist and seal liquid storage containers, and I have never been happier with a tupperware product in my life.
I haven't put anything in these that is smoldering hot, so I'm not sure how hot the container feels when really hot liquid is in these, or how long hot liquid stays hot..... BUT...
They are fairly light weight, and the plastic feels really durable and of high quality.
I have found that these medium sized twist and seal liquid storage containers are the perfect size for a serving of soup.
I also use the containers to make my own salad dressing at home. Olive oil+ lemon juice and grey pupon for instance. Then I screw the cover on and shake shake shake.
This also ended up being a great test to see how much leakage there is, and there was NO LEAKAGE. I would be confident throwing one of these babies full of liquid in my work bag with all of my papers and what have you.
These are also so easy to clean. I haven't seen any gross staining after two weeks of continuous use.
Rubbermaid twist and seal liquid storage containers are are great quality product for a reasonable price.