Versatile Styles For Wherever The Day Takes You—Shop Now
Home Page

Detail Images

Current Color

Big Agnes Star Fire UL Sleeping Bag: 20F Down

$499.95 - $529.95

Star Fire UL Sleeping Bag

Big Agnes designed their Star Fire UL Sleeping Bag with your lightweight trekking adventures in mind. The 850-fill DownTek is water-repellent and maintains a 20F temperature rating for three-season comfort. The traditional mummy shape features vertical sidewalls, an ergonomic foot box, and body mapping to trap heat so you can stay cozy all night. The contoured hood cradles your head to keep you comfortable while the insulated tube along the opening keeps out drafts when you cinch it tight. The inside of the bag has loops to attach a sleeping bag liner and loops on the outside let you hang dry and store your bag easily. The included stuff sack and storage sack make packing and unpacking a breeze. 

  • Three-season warmth in an ultralight mummy sleeping bag
  • 850-fill down maintains a 20F temperature rating
  • Mummy shape keeps the bag light while increasing warmth
  • Upper hood has an insulated tube to seal out chilly drafts
  • Body mapping and vertical sidewalls trap heat close to you
  • Minimal zipper keeps weight down while reducing cold spots
  • Included storage sack and stuff sack make packing a breeze
  • Item #BAGZ28A

Responsible Collection
Pertex Quantum (100% recycled nylon ripstop)
850-fill DownTek (hydrophobic)
Max User Height
[small] 5ft 5in, [regular] 6ft, [long] 6ft 6in
Shoulder Circumference
[small] 54in, [regular] 60in, [long] 62in
Hip Circumference
[small] 54in, [regular] 54in, [long] 56in
Foot Circumference
[small] 34in, [regular] 36in, [long] 38in
Draft Tube
Fill Weight
[small] 16oz, [regular] 18oz, [long] 20oz
Storage Sack
Stuff Sack
Stuff Size
[small, regular] 7.5 x 15in, [long] 8 x 17.5in
Claimed Weight
[small] 1lb 10oz, [regular] 1lb 12oz, [long] 2lb
Manufacturer Warranty
weekend camping, winter camping

Tech Specs

What do you think about this product?



Star Fire UL Series Sleeping Bags

These technical, ultralight bags are designed for adventures where every ounce 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," our 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.