5 Stack a Boxes Food Storage Containers 2.5L 5 "Amazing!" Jennie 11 November 2019 I have all the sizes of these Stack A Boxes and they are brilliant. They keep food fresh in the fridge, can go in the freezer and you can also microwave them. They don't seem to stain with tomato sauces or baked beans. They can be used for packed lunches. They are simply amazing. I love them.