I bought these to seperate my sons snacks in his lunch box and they work great! Very flexable yet sturdy. It is great to be able to send him with things that need to be heated up (by them selfs) and knowing that all he has to do is throw the small cup in the microwave and cook for a few seconds. Makes packing his lunch a lot less stressful with having the option to send "warmable" things as well :-)