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

About 20 years ago a guy named Ranger Rick was converting poncho liners by sewing a zipper on three sides so it would close up into a roomy sleeping bag. He also cut a small line in the middle for the head so one could wear it as insulation and had a zipper sewed there to close it while using as a bag. The kits to do this might still be available. I still have it. Wouldn’t want to put a non breathable poncho over because that can cause condensation. Tried it with a silnylon tarp and condensation was bad. The poncho liner itself is good to about 60°. It’s a summer bag for the most part in most areas. It’s heavy for what you get. I I’m remembering right it’s about the same weight as the 20° down bag I use.

I tend to agree. After watching several videos by people who are advocates the system sounded interesting. However, having a waterproof cover would create a condensation problem as you mentioned. Also, the weight totals more than my summer bag (0.8kg, 1.75 lbs.) plus a light weight tarp. And the woobie setup would not be as warm.
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Thanks for sharing your experience.

Hello, @Jim M. The link worked for me. I haven’t had the chance to use this kind of system before. I usually rely on traditional sleeping bags when camping, which are a lot heavier. The item in the video looks like it requires some effort, but it’s definitely more compact and lightweight. I wouldn’t mind bringing one of these along as long as it’s not winter, as it wouldn’t be enough without a tent and with snow involved.

The complaints I've heard in the past regarding the woobie is the overall weight of the system (as others noted). Jacks R Better does sell a down quilt with a slit in the middle to allow it to be worn as a poncho.

https://www.jacksrbetter.com/product/sierra-sniveller-wearable-camping-quilt/

I personally wouldn't want to sleep under a poncho unless my needs more closely aligned with the army's (making it slightly less likely to be discovered by an advesary while on patrol/mission).

I think something like the jacks r better quilt with a lightweight poncho would be good multi use equipment options for shoulder season or emergency situations.