The strap pictured is not included in the scope of delivery.
The doors and grille all go on very smoothly and to. The snail itself has no chance, one of the two gratings to open from the inside, even if it is very clever.
There is the "roof" of the box small harness slots that meet their service very good. The box is held firmly by the vehicle seat belt, even if the car jerks times.
If it's out fresh and the wind blows, you should consider to put a blanket over the box, but that's obviously not a drawback, since you can see how open it is.
Overall, I am very satisfied.
+ Stability
+ Assembly
+ Belt fasteners
+ Optional shoulder strap (not included)
+ Removable water bowl with splash
- Possibly a bit too small for example, adult, big cat