The Docter 7x40 IF seems virtually indestructible. There's some information somewhere on the net about the tests the original version made for the East German army had to pass, and I doubt any civilian binocular would pass these tests.
Generally speaking, some of the military binoculars (including the Hensoldt range and the Swarovski Habicht range made for the military as well as the Russian BPO 7x30) are *very* tough. I only know the Hensoldt and the BPO 7x30 quite well, and these things can take a beating. Plus these binoculars are all easily serviceable, compared to modern roofs with centre focusing.
So, if you go on an expedition for a few months, to some inhospitable place, I think any of these bins would be very likely to survive (even if you don't ... :king

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Hermann