Sacre bleu! Eet eez, hou doo yoo say... een French! (You have to pretend I'm Maurice Chevalier)
What is that? A boy scout crepe? Lol...
OK, enough ethno-centric jokes (though my grandmother is French-Canadian...). Isn't a regular poncho liner about "double" size? I find that I can fold that over myself and be covered, though I tend to kick it off me. A Queen might be nice, but too heavy? Plus, would you want your insulation under you, where that cold ground is, or over you? I suppose it depends on your choice of sleeping environments for the blanket.
Out of curiousity, who came over and tied that kids feet, since he's already rolled up?