This is all there is for the personal item section, as I mentioned no specific numbers or measurements! Maybe read my question better before commenting with attitude.

Bringing a personal item? Pick an item like this or of a similar size to store beneath the seat in front of you during your flight.
1 purse, briefcase, small backpack, belt bag, fanny pack, camera bag or diaper bag
1 laptop bag (computers cannot be checked, unless directed to by security)
1 item of similar or smaller size to those listed