if you mean hand carry luggage -- there is a certain limit on the quantity of perfume or other amenities you can carry onboard the aircraft with you.
Obviously, sharp objects, such as forks/knives etc won't be allowed.
If you want to know what you should carry with you in flight... I'd take my laptop, some chips/snacks, gum, mobile charger (seats have a plug where you can charge your appliance). Also, try and stay hydrated throughout the flight and avoid fizzy drinks or juices. It's important for the body at such high altitudes!