"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."