I love these! The entire stack takes up so little room. The stack is only about 6 inches high. They go through the microwave and dishwasher beautifully and do not warp. The seal is good and tight. Portion size is bigger than it looks. These are great for taking a meal to the airport because you can just throw them away after since they are relatively inexpensive. You can take food through TSA as long as you don't have any liquids or dressing over 100 ML.