Hey all,
I'm looking to go to the NOLS Semester and noticed they require a bag which goes to -15 degrees. Right now I have a Montbell u.l. s.s. #3 and I can't really afford to buy a light weight sleeping bag that will go that low (they are like $500).
Wiggy's claims their overbag will add 40 degrees to my bag, meaning it would go to -10, and then with my silk long johns I'd probably be OK down to -15. They also claim this overbag weighs 2 pounds. It's also only $190.
At the same time I've heard bad things about the durability and wind resistance capabilities of Wiggy's bags.
Anyway I was hoping you all could shed some light on whether overbags work and if there are any good lightweight ones out there. Thanks!

