J.C.
I was a summer camp counselor for many years. The thermos idea is great for days that the children are staying at camp but on days that they are traveling, such as field trip, it is much better for the child to have a completely disposable lunch. A plastic grocery bag holding their lunch can be used to hold garbage and if you freeze a juice pouch overnight, the lunch will stay cold until lunchtime and the child has a slushy treat with their lunch.