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?