Get a $300.00 Leupold Mojave 8x32 for roughing it. Then when you trash it you won't be crying.I had a $1500 bin [Elite] ruined in an hour long deluge - I did my best to protect the bin but, in the end, one tube fogged and never fully recovered. That was the end of ''nearly'' waterproof bins for me.
https://www.amazon.com/Leupold-117985-8x32-Mojave-Black/dp/B00DT46ZY4