For a large cat, prioritise a stable carrier with a suitable load rating, secure fittings, ventilation and enough usable space to stand, turn and lie comfortably. The best choice also has an opening you can manage calmly. It also needs to fit your vehicle and be liftable with the cat inside. Compare current product specifications and inspect how the base and lid connect rather than relying on a label such as XL.
A top opening or removable top may be useful for some cats and veterinary visits, but the exact design matters. Check replacement parts and cleaning instructions before ordering. If possible, discuss the choice with your veterinary practice, especially for a cat with mobility or handling difficulties. A comfortable fit and dependable construction are more important than fashion, a dramatic photograph or a claim that the carrier suits every breed.
For product comparisons alongside this advice, see Rolling pet carrier and 90 cm folding soft crate. The details below explain their sizes and uses.
Further reading: cats.org.uk; pdsa.org.uk; cats.org.uk.
Rolling pet carrier
90 cm folding soft crate