I'm not disputing that silnylon tarps or any of that order are not the way to go if you are weight conscience, but you can get tents that are in the 32 -48 oz range (2-3 lbs assuming 16 oz equals 1lb) and yes some are not cheap nor are they for everybody. I'm just saying for a few lbs more the benefit may be worth if that's all.
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Failure is not an option!
USMC Jungle Environmental Survival Training PI 1985