Innovative construction brings down-like weight and packability to a synthetic bag.
It has the best warmth-to-weight ratio here; testers pushed it 10 degrees below its 23°F rating.
An ultralight bag that breathes
A water-resistant down bag made with Sierra Designs' DriDown.
Cross a super-warm bag and a weatherproof bivy and you get the Wraith.
This ultralight sleeping bag packs small but lofts quickly for a warm night.