This ice mat is great that each one comes in it's own plastic sealed compartment,  when you simply do not want to use the large icy blocks that come with the lunchbox.  There is no reason to remove them from the compartment which can be wiped off.  The ice mat is divided into small cubes that can fold over and around your food.  After having used it for over 3 months now, I am surprised to have not seen any damage to it.   So far no leaks have been detected and it's easy to just drop it in the freezer in the evening so that it'll be ready for use the next day.  It simply does what is expected from it and it would not disappoint.