We have a quick table we put together showing some of the differences on U.S. domestic airlines along with examples that meet the requirements as of this writing:
After all, the best personal item bag for travel is one that will hold all the things you normally carry with you, along with the extras you decide to bring to make your flight comfortable.
Protecting valuables with the best carry on personal item can be challenging, but we managed to find several items that fit the bill.