I can vouch for these things...
We used 15-20 or so of them in my mobile comms unit back in the day.
They went through pouring rain, sandstorms, drops, altitude changes, as well as having hundreds of pounds stacked on top of them on pallets.
They are more or less indestructible.
I read a magazine article once where they put a DSLR+lens inside one and tossed it down a 20-30ft waterfall lol. It hit rocks on the way down and bounced a bunch of times.
When they opened it the camera was dry and worked like new.
- Neil