Carry-on baggage weighing up to 7 kg and with dimensions not exceeding 115 cm is always free of charge. A smaller item (handbag, coat, laptop) is tolerated as a second bag.
All Economy Class passengers cancheck in a bag up to 30 kg free of charge, while on flights to the USA and Canada you can take two bags up to 23 kg each.
Sporting equipment up to 30 kg counts as regular baggage and there is no charge if you are travelling with just this.
Singapore Airlines only carries pets in the hold, with the exception of assistance dogs.