Travelmonkey
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I thought this might be of interest as electric blanket comes up often as a means to stay warm, but is impractical as an off grid solution due because 120V. This blanket is powered 5V via USB (backup battery or cig adapter). It is kind of expensive $140 and available on one of those "kickstarter" type webstores. It is made with down, though. In comparison, the 12V mattress pads that truckers use is around $90 on amazon.
https://www.indiegogo.com/projects/rakin-world-s-first-5v-battery-heated-blanket-camping#/
https://www.indiegogo.com/projects/rakin-world-s-first-5v-battery-heated-blanket-camping#/