After a long search a thermos I ended up taking it I use it for 1 week and I'm not disappointed. The capacity is perfect I thought it would be a bit big but ultimately it's battery is needed for a good meal to slide in the school bag. It keeps the heat quite well, it is necessary according to the user manual, pour boiling water into the thermos close it and wait 5 minutes for the simprègnent heat walls. I vacuum and then put my hot meal at 7:30 in the thermos and eat around 12.30 / 13h and the meal is always hot. The lid can be used as a base to eat, and it is very easy to clean. The only downside would be the noise of iron fork against the walls but rather unpleasant aluminum covered plastic will do the trick to remove the inconvenience.