GHB (gamma-hydroxybutyrate) is produced naturally in the human body in very small amounts. When taken as a recreational drug, and especially when taken in combination with alcohol or other drugs, GHB can be extremely dangerous. GHB is a central nervous system depressant.
International flights always allow carry-on luggage, but each airline has its own restrictions as to quantity, size and weight. Some international carry-on policies restrict bag weights to 11 lbs. or less, while domestic flights rarely have a weight limit.
this applies whether the flight is domestic within the us or international most flights that originate from outside the us have a weight limit for total checked baggage a miserly 20kg 44lbs if you re traveling in coach class 30kg 66lbs for business class and 40kg 88lbs for first classost airlines now charge extra for suitcases weighing more than 50lbs whereas until a few years back they d carry suitcases weighing up to 70 lbs with no surcharge and if you re lucky they will allow two free pieces of luggage whereas before you d often be allowed three