Here's what other sites are saying:
Rab Camp & Hike Expedition 1400 Sleeping Bag 850 Down Formula One QSM25LZ. With 1400g of the highest quality 850FP European Goose Down the Expedition 1400 is designed to offer warmth and protection in temperatures as low as -40 . Specifically designed for expedition use the Expedition 1400 is slightly oversized to accommodate larger Expedition clothing and uses a combination of high quality Pertex inner and outer fabrics. Key technical features include water-resistant linings at the head and foot to prevent water ingress longitudinal baffles to minimise down migration and a face baffle for improved use with a hood. The Expedition range of sleeping bags are hand-filled in Derbyshire UK.
Let's cut to the chase: the Rab Expedition 1400 -40 Degree Down Sleeping Bag keeps you from freezing to death in the harshest environments on the planet. Period. Water-resistant Pertex Endurance and Microlight fabrics prevent outside moisture and body perspiration from compromising the loft of its 850-fill European goose down. This absurdly warm insulation traps precious body heat when you're sleeping 500-miles above the Arctic Circle or camped precariously above 20,000-feet. Also, the down's hydrophobic coating repels moisture from killing its heat-trapping loft. As if that's not enough, the massive amount of down filling amounts to over three-pounds in weight (fill weight is actually 49. 9-ounces) for a bag that's comfortable down to negative 40 degrees Fahrenheit. The warmest bag in the world isn't any good if your body heat seeps out the cracks like a leaky faucet. Realizing this, Rab carefully designed the Expedition with close-fitting neck and face baffles, complete with a collar and drawcord hood to lock-in fiery body heat in sub-zero temperatures. At the torso, the longitudinal baffles use Flowgate technology to keep down from migrating and subsequently leaving you with cold spots. The footbox has longitudinal baffles as well. Other well-thought features include an internal zippered stash pocket and dry bag compression sack for weatherproof storage and carrying.
Features of the Rab Expedition 1400 Sleeping Bag Pertex Endurance outer fabric Pertex Microlight inner fabric Pertex Endurance inner fabric in hood and foot 850FP European Goose Down Rab fluorocarbon free Hydrophobic Down developed in conjunction with Nikwax Improved close Fitting neck baffle design Longitudinal chest baffles with internal Flowgate Technology to control down Face baffle for improved hood Fit Mummy shape Longitudinal foot baffles to minimize down migration Proportionally assigned differential cut Internal YKK 3 coil zipped stash pocket Down clothing compatible (larger internal lining than other Rab sleeping bags) 3/4 length YKK 5 coil main zip Left hand zip only Anti snag zipper webbing tape Internal collar and hood drawcord Trapezoidal baffle chamber design Angled foot box Internal drawcords Dry bag compression stuff sack Cotton storage sack Hand filled in Derbyshire UK