The North Face Dolomite Eco One Double LONG Convertible 2 person 15 degree sleeping bag.  Heat-seeker Eco Synthetic Insulation.  
3-in-1 double sleeping bag with comfort for changing temps
Top layer has 50F-rated Heat-seeker Eco insulation
Mid layer has 30F-rated Heat-seeker Eco insulation
Pair the above two together for 15F-rated insulation
Mid layer lined in fleece for extra softness
Zippered security pocket stashes small items near by