For binoculars, you might want to look out for the top Black Friday Optics Deals. They're durable, give you great image clarity, and were a steal at the discounted price.
As for an 80L pack, I've had good luck with Osprey. They're not the cheapest but definitely reliable for those longer trips. Tents and sleeping gear are a bit subjective based on how much comfort you want versus weight you're willing to carry.
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