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.
Baggage Policy. Singapore Airlines. Free Baggage Allowance-With the exception of travel to/from the US or Canada where 2 pieces of checked luggage at a weight of up to 50lbs each(23kg) is permitted, the free checked in allowance is 44lbs(20kg) total, and an additional 7kg for carry on luggage.ree Baggage Allowance-First checked bag is free, 2nd is $20 CAD max of 50lbs (23 kg) each, and an additional 44lbs (20kg) maximum of carry on luggage within Canada, and for Mexico and the Caribbean.