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Amazon.com : Heated Sleeping Bag Liner - Travel and Camping Sheet, Pocket-Size, Lightweight, 100% Cotton Flannel Fabric, Special Metal Heating Plate with Maximum Power 9W, USB Interface, NOT Including Battery : Sports
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Amazon.com : Litume Thermolite All Season Sleeping Bag Liner Add Up to 22F, Mummy Sleeping Sack Backpacking, Camping, Traveling, Lightweight Sleep Sack with Drawstring Hood (E626 US) (Thermolite) : Sports & Outdoors
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