It is the suitable size for a small dog like ours, 6 kilos, a bit low in height, but quite spacious for it to be able to turn around, with the difference that on one flight it fit under the front seat, on the return it did not, so we took it out of the box and had it next to us in the seat. And the transport bag in the overhead compartment. I think that airlines have made it somewhat difficult, not to mention anything worse in this area.