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This forum has ALWAYS been very clear that the poles are NOT allowed on board FROM the Santiago airport.
Santiago is the most strict strict airport in this regard.
I carried an Osprey Sirius 36 liter. Shorter and about your weight but those don't really factor into pack sizing. It's your torso measurement that tells you the size and the gear tells you the capacity. 36 liters carries up to 20 pounds...
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