Typically, economy class passengers can carry 20-23 kg (44-50 lbs) of checked luggage, while business and first-class passengers may carry 30-40 kg (66-88 lbs) of checked luggage. Additionally, passengers are also allowed to carry one piece of hand luggage, usually limited to 7-10 kg (15-22 lbs) in weight and specific dimensions set by the airline. Extra baggage can often be purchased at an additional cost, but it is advisable to pre-book it to avail of lower rates. Also, it is essential to be aware of any restrictions on carrying specific items, as certain goods may be prohibited or require special permission from customs authorities.