Singapore Airlines Baggage Policy varies by class and route. Economy Class travelers are allowed 30kg of checked baggage, while Business and First Class get 40kg and 50kg respectively. Hand-carry allowance is generally 7kg for Economy and two pieces for premium cabins. Restrictions apply on size and weight. Passengers are encouraged to review their ticket conditions or consult the airline’s website for up-to-date baggage information and guidelines.
https://www.baggageinfo.com/blog/singapore-airlines-baggage-policy/