Sack + sharp = blanket/tent/reflector/whatever.<br><br>Besides, this thing is large enough (I have one) that wraping a space blanket round the sack inside it's carry bag adds negligable bulk and weight.<br><br>Personally, I don't find it suitable for a PSK (even the "in the woods" PSK) unless you do something like flatten it out in the game pocket of a vest.