We have a lot of boxes ordered for comparison ... But the Sukdo boxes were able to convince us.
The box is really safe to close. The door has a good and safe lock and side locks with security are also very safe. In addition, the box has 4 "anchors", which mesh in the upper and lower shell, thus ensuring additional stability.
The Sukdo box is probably the only one which can withstand a fall without falling apart.
Particularly of the more expensive "Gulliver Box", which we had also ordered for comparison, we were very disappointed.
The Gulliver box was very unstable unfortunately the closure and had us too uncertain.
When Suko Box but I finally feel good and am now no longer worried about our Ninchen :)