The first impression, confirmed the price. The bowls are made in Turkey, and, according imprint between -20 degrees Celsius and +95 degrees Celsius are used. The content will be give in accordance with imprint 1,75 liters, and not as in the item description with 1.8 liters.
These are the facts.
The bowls are now used and complete your tasks without any problems. The aeration or the "valve" must be operated manually.
Practically I find the handle in the middle of the lid can be lifted from the bowl. But be careful: After heating in the microwave this is also warm to hot, depending on the degree of heating of food.
The 2 closures for the lid to function perfectly. Only time will tell how long they will keep.
We will definitely replace the bowls again by more expensive Tupperware, but continue to use these anyway.