A "Woobie" is another name for a Army Poncho Liner. It is a blanket really. It is quilted nylon on Polyester Batting. Measurements vary, but about 62" x 82" according to one source. The idea seems intriguing. It is designed so that it fits perfectly into a poncho to make a (approx) 32 x 82 inch sleeping bag. So your poncho has two functions: Raincoat and bivy sack. While weights also vary, it appears the two together might weigh 3 pounds.

Has anyone here actually used a poncho liner and poncho as a sleeping bag? Any problems? Your guess at temperature rating? Don't know if this link will work here or not.
https://www.bing.com/videos/riverview/re...amp;FORM=VRDGAR
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Jim M