Sana Tritan vacuum containers have a vacuum indicator which shows when you have removed enough air for proper storage. This removes the guesswork when using a manual vacuum pump.
You can also record the storage or expiration date with the dial on top of the container. This way you will know how long the food has been stored.
I am looking for vacuum containers that are not Made in China. Where are your containers made? And when will they be back in stock? Thank you.