A hard-shell carrier is positioned as safe transport: fixed structure, defined ventilation and easy seatbelt anchoring suit vet visits, moves and air travel.

A soft bag is light, foldable and easy to shoulder-carry, which helps on short walks and public transport. The trade-off is weaker support, limited posture and possible deformation after scratching.

Choose by weight and temperament: a cat that panics and throws itself around needs hard-shell protection, and larger cats need confirmed load capacity and a supported base.

Either way, train the cat to enter the carrier before you need it, so it becomes a familiar resting spot rather than a signal for a vet trip.