In operation has shown that the central lock will be operated with caution. Since the case is rather soft, are the sidewall when closing the buckle and snaps not necessarily. This can be seen with more or less annoying emptying the box during lifting. Test times gently lift So after closure.
If you know it, but this is not a ko for the boxes, but they were very inexpensive. I have three sets in use and they hold up well.
