
Haven't tried to do a leak test. I froze some food in it and it got really cold and I accidentally dropped one and it broke. I also dropped something on a string during a freeze and it broke. I've reheated them in the microwave and they did the trick, they didn't "bubble" with sugar or acid like other plastic food containers. Washed them several times in the dishwasher, everything is fine. In my opinion it's more like what you get to take away. Not for long-term storage.

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