These technical, ultralight bags are designed for adventures where every gram counts, each nook and cranny in your pack is accounted for and you depend on the performance of your sleeping bag like you would a harness, helmet, or beacon. 
The "Fly Creek of sleeping bags," the Big Agnes Star Fire UL series features the ultimate 850 fill power DownTek™ water-repellent down and are built with a superlight, high-tear strength shell that also protects the inside footbox. Body-mapped baffle construction optimizes thermal efficiency creating the lightest, highly compressible bag for your most remote of overnight adventures.

FEATURES:
Ultralight down mummy bags that feature 850 fill power 
DownTek™ down and a Pertex® shell to create our most compressible, technical bags
Traditional mummy shape allows for lightweight and increased thermal value
Body mapped baffle construction optimizes thermal efficiency
3-D anti-snag draft tube prevents heat loss along the zipper
Vertically structured sidewalls integrating contoured baffles trap heat closer to the body
Contoured hood baffles cradle the head for a more comfortable fit
Oversized interior anti-draft collar 
Ergonomic foot-box construction provides more loft and warmth 
Low-profile cordlock lets you un-cinch the hood with one hand
Insulated tube along upper hood opening seals out drafts when cinched 
Minimal zipper minimizes weight and reduces cold spots
102 cm YKK #5 anti-snag zipper for a smooth, quick zip 
Zipper Garage
Interior fabric loops for sleeping bag liners
Streamlined exterior loops for hang drying or storage
Storage sack & stuff sack included

SPECIFICATIONS:
Bag Weight 652 g 
Fill Weight Regular: 284 g 
Compressed Bag Size: 13 x 14 cm 
Stuff Sack Size: 19 x 38 cm