See your pharmacist for these. The cage should have sufficient openings for good ventilation. The cage must have sturdy handles for baggage personnel to use. The cage should have a water tray, which is accessible from the outside so that water can be added, if needed. Pet stores, breeders, and kennels usually sell cages that meet these requirements.
Some airlines also sell cages that they prefer to use.
Check with the airline to see if they have other requirements. Try to familiarize your cat with the travel cage before you leave for your trip. Let your cat play inside with the door both open and closed. This will help eliminate some of your cat's stress during the trip. Be sure that your hotel will allow cats.