I ordered a 700 fill down king size pillow from Overstock.com today .... next project is a new down top quilt.
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What clothing are you basing this rating on? If 50* is going to be the very low for the trip, I consider that a warmer season and probably wouldn't have more than perhaps a vest or rain jacket packed along. Would you sleep in a thin T-shirt, shorts, simple beanie and thin socks at that temp with the 2.5 oz/yd insulated underquilt and no leg pads?
So maybe i'm missing something which could be quite possible but is the main tradeoff here space vrs money. Is the clamshell that much cheaper that its worth the bulk, or does down pack small enough that its worth the extra $$$.
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