I just put two of these on order. From the reviews I saw looks like it will be good down to about 30 degrees with a inner blanket. Not a small lightweight item, but neither am I
http://www.ebay.com/itm/Snugpak-617...176277?hash=item4b0fb6a915:g:wZgAAOSwo4pYUD8r
http://www.ebay.com/itm/Snugpak-617...176277?hash=item4b0fb6a915:g:wZgAAOSwo4pYUD8r