This set is so great! I'm a chronic over-packer and use the middle size the most. Have checked it on planes 6 times in the last 8 months, had it searched via TSA 2 times and have not had anything inside break or get lost. Also, amazingly, I have never had it be so heavy I had to pay extra since the nag itself is pretty light. Holds so much and are so easy to wheel around.