I get on small planes alot most of the time if their is not enough room in the over head they put in under your seat.I have almost been doing a walk of shame because of other people over sized bags,When i tell them that I've not the money to check it,And it's not my bag that is too big.It seems that airlines pick on women who are by themselves a lot more then men.Oh my over size pack is under 2100 cu in.It's 18x9x5.So sometimes it's not the bag.