**NOTE:** Product's length is 'Regular Length' We didn’t think it was possible either​,​ but the Hydrogen is even lighter and more packable than before. The new curved baffles on this bag reduce shifting of the down​,​ allowing this bag to provide enough warmth for cool-weather climbs and backcountry excursions; a new easy-access​,​ fold-down second zipper allows easy ventilation. At just a pound and a half​,​ this bag puts the ultra in ultralight. FEATURES: Fold-Down Second Zipper Provides added Ventilation​,​ Easy Access. Anti-Snag Slider reduces Snagging Anatomically Designed Footbox with Wrap-Around Construction increases Warmth Smooth-Curved Baffles Reduce Down Shifting. Nautilus Multi-Baffle Hood limits heat loss Filled and Finished in Rohnert Park​,​ California Certified 800+ Fill Power Goose Down Ultralight Pertex Microlight 20d 100% Nylon Ripstop DWR 1.03 oz​/​sqyd EN Tested Full Length Locking YKK Two Way Zipper with Zip-Guard Slider Down Defender to Improve Water-Resistance in Wet Conditions Internal Stash Pocket Snagless Insulated Draft Tube Two Way Zipper Sliders Hood Draw Cord Zipper Garage Two Hang Loops SPECS (REGULAR LENGTH): Insulation Material: 800+ Fill Power Goose Down Fill Weight: 10.9 oz Bag Loft: 4 Bag Temperature:30° F Interior Length: 81 in Bag Dimensions (shoulder x hip x foot): 61 in x 56 in x 39 in Weight: 1 lbs 7.3 oz SPECS (LONG LENGTH): Insulation Material: 800+ Fill Power Goose Down Fill Weight: 13.8oz Bag Loft: 4 Bag Temperature:30° F Interior Length: 87in Bag Dimensions (shoulder x hip x foot): 63in x 58in x 41in Weight: 1 lbs 11oz SBID: SBU3Q841