For cars, the safest choice is a well-ventilated carrier that keeps your cat contained and does not slide around. ASPCA recommends a secure carrier that is large enough for the cat to stand, sit, lie down, and turn around. That is the baseline worth shopping for.
The best carrier also matches your cat’s personality. Nervous cats usually do better with a sturdy top-opening design, a removable liner, and enough room that they do not feel pinned in. If you only use it for vet visits, a soft carrier can be fine as long as it still feels secure. If you travel by car a lot, hard-sided usually wins because it is easier to clean and less likely to collapse.
Measure your cat before you buy. Then look for a carrier that is easy to wipe clean and easy for you to carry without wrestling it. Check the latches too; a carrier that pops open under stress is worse than one that looks less stylish. Put a familiar towel inside and leave the carrier out for a few days before a vet trip; if the only time the carrier appears is right before the car ride, many cats learn to hide.
A good cat carrier should make the trip calmer for both of you. For dog-specific containment, see the dog crate guide. If the issue is walking or car transitions rather than containment, the dog harness guide is closer.
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