[header] How to choose a cat carrier [title] Do not pick a carrier that is too big or too small. [step] Carriers that are too big will cause your cat to tumble about as your transport it. This is very uncomfortable and unsafe for your cat. 
On the other hand, your cat my feel cramped inside a small carrier, which may increase the anxiety it is already feeling. [substeps] It is also hard to balance large carriers as you transport them, especially if your cat is inside.