whatever i feel like, life's too short to worry too much. before the luggage restrictions i'd bring a handbag and a tumi laptop case, and a tumi wheelie. sometimes it was a tumi laptop case, handbag and a bigger longchamp bag. now it's just a handbag that fits my laptop and the only two that fit that criteria are my balenciaga besace and my bv woven hobo. they're both a little too small but it's ok for a flight. i've never worried about putting stuff under the seat either, if it gets dirty you clean it. i've never had a bag stolen on a plane either. a duty free bag once but not a handbag.