I am using this to hold Astronomy Observatory pieces... Lens, adapter, etc. It is water tight and if the observatory roof leaks during a big storm, no worries do to this water tight box... I have purchase this box in various place about a dozen times... I think I now have enough!
It's not as large as I thought it was, but that doesn't really matter.
It's really sturdy and well-built.
The pull-apart foam is great, and it has two layers of the stuff (plus a thin non-pull-apart layer at the bottom and another for the lid).