Something I always carry, rolled/folded up...an old (really old - my grandfather's WW1 issue) ground cloth - which I spread out on the ground before laying my backpack on top of this. Keeps the backboard and straps clean and dry, and helps keep dirt/sand/water/snow off of gear. And yes...about those boots - very important!
Drew...as you must know - those rescue choppers take great skill to fly at such high altitudes. I spoke with one climber who'd helped to lift and throw a small rescue chopper off the ground above the Khumbu icefall - air so thin that it lacked the lift necessary for the extra load, so six climbers literally lifted the chopper by its runners as the engine was going full tilt...and threw it upwards as it gained enough forward speed to barely clear the lip of the icefall. So hats off to your uncle!
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