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.
The United Airlines (UA) baggage policy for regular basic fares include the following: Carry-on baggage. 1 personal item - Fee free. 1 carry-on item - Fee free. Checked baggage / Hold luggage - Applicable fees per bag increase with number checked beyond 2 bags.