Sturdy plastic, it requires a little extra effort to close. If the child is in elementary school, they will manage, but for kindergarten it might be a bit difficult. After a month of washing in the dishwasher, the print with the animals has started to fade. Regarding the temperature preservation of the food, it goes without saying that it doesn't keep it stable, as expected. The food takes on the ambient temperature after a short while.

For the classic lunch bags, combined with a second container, the closing of the bag will be borderline.

A 5-year-old child can handle it on their own (open, close).
It is sturdy.
Depending on the food, it may require more washing with hot water and patience in the corner areas to be fully cleaned.

A 5-year-old child can handle it on their own (open, close).
It is sturdy.
Depending on the food, it needs more washing with hot water and patience in the corner areas to be cleaned well.

Good in terms of build quality. Relatively large. Check the dimensions because you might want something smaller.
It doesn't clean very easily, I can say (you have to insist quite a bit if you have put oily food) and it doesn't close easily from all sides. One side may slip and you may have a leak.

Nice bowl for preschool and older children due to the closure. It still doesn't leak and cleans very easily, the oils with a little warm water though like all bowls.

Beautiful and quite big. I think it will be useful for kindergarten... I would like it to have a rubber on the lid. I believe it would be a little safer that way...