5. Mountain Hardware's Banshee SL-10 Sleeping Bag
With welded instead of stitched seams, this sleeping bag will keep you dry no matter the size of the storm outside. The bag is made of nylon covered by a waterproof, breathable laminate. Inside are 28 nylon tricot tubes, full of down, welded to the shell. We couldn't test the bag, which weighs 3 pounds 3 ounces, but the company claims it withstands 22 inches of rain in 24 hours.
Available this spring for $400.