Loved as a retreat and resting place of my Maine Coon males than Transportbox less suitable because the door latch hook quite "baggy" and are easily adjustable, so that the door is not securely closed. It also appears for animals of this weight (the larger cat weighs 7.8 kg) is not to be construed. After the last vet visit was when parking the box, the door of the upper bracket, fortunately inward .... The transport box is "broken" delivered, the assembly is easy and problem-free. The lifting of the upper part is easy, but a few large shutters to open it. You can secure the box for transport in the car with a few simple steps using the existing seat belt. Vents, a closable opening for "pats" and a small compartment for accessories are available. All in all, a shapely and stable acting Box, for transporting heavy animals but not so good.