"The Sportsman's Guide" HQ catalog just arrived with a USED
U.S. military 2-sleeping bag combo and woodland camo Gore-Tex bivy sack for $179.!!! Cat. # AX8M-135580
Likely well worth it for people on a budget.
Camo GTX bivy sack > 2 lbs.
Black bag > +30F to +50F fill is Polarguard HV 3 lbs.
Camo bag > +30F to -10F Polarguard HV 4 lbs.
Combined sleeping bags & bivy > "supposably" good to -30F ("When expedition weight long johns are worn.")
Sportsmans' Guide > 1-800-888-3006
"There are no comfortable backpacks. Some are just less uncomfortable than others."