[MENTION=90382]Barkinpark[/MENTION]: Take it from someone who does know: Insulin and "bunch of other gear" fit very nicely even in the pocket of a coat or one's pants. I guess your family member looks for an excuse to keep his/her roller luggage in the cabin. By the way, there is one precaution I took the few times when I had to self-inject medication during a flight. I told the FA what I was going to do in the toilet and even showed her the vial, as I didn't want them to open the door for whatever reason and think that I was a junkie. She said, in return, that she was going to keep people from trying to open the door to keep me calm!