They are very pretty but they just don’t keep food hot. I’m sad because we now have 2 big ones and 2 small ones. I preheat the metal containers with boiling water. I heat the food to piping hot. Sadly the food is just kind of warm by my kids lunchtime (packed at 7:30 am, lunch around noon). I think it’s the metal caps that cause the issue because they will feel warm to the touch after packing indicating heat transfer. I plan to go back to the Thermos containers we used before. Not as cute but they truly keep things hot.