Army Poncho liner
poncho liner is a piece of field gear originating in the United States military intended to provide warmth in mild temperatures used as a field expedient sleeping bag when attached to the standard issue poncho by means of integral lengths of material which are looped through the poncho's eyelets.
The poncho liner consists of two layers of quilted nylon encasing a polyester loft filling. There were tie-cords on the corners and side that could be tied through matching grommets on rain ponchos. They measured 62 x 82 inches. Most examples are a variation of olive drab on one side and camouflage on the other, either ERDL pattern in earlier examples or the later Woodland pattern, as well as the MARPAT and Universal Camouflage Pattern and MultiCam most recently. Commercial copies include features like thin sulate batting, a zippered edge and come in a greater range of colors. The CIA-funded Counterinsurgency Support Office (CISO) on Okinawa developed a lower cost smaller 49 x 75-inch gray-green poncho liner for used by the Special Forces-advised Civilian Irregular Defense Group (CIDG) in Vietnam.