Blackburn UL 0°

Down fill Big Agnes System bags designed to excel in all conditions and provide more room than a mummy bag

Down fill Big Agnes System bags designed to excel in all conditions and provide more room than a mummy bag

The Blackburn UL 0 is one of our most technically designed Big Agnes System bags, using our full pad sleeve design, a very durable nylon rip-stop shell fabric, and super cozy 850 fill power DownTek™ water repellent insulation. This bag combines ultralight versatility with a long line of packable creature comforts. Whether you're a 3/4 length-pad-carrying, fast fly tent-gram-counter or just gearing up for a cold weather hut trip where weight and packed size in important, this is the go-to bag for you.
$479.95 to $519.95
100% Guarantee


Our top priority is to provide customer service as stellar as the award-winning products we create. If one of our products does not perform to your satisfaction, contact our customer service team and we will help you find gear that fits your needs.
$479.95 to $519.95

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Specs + Sizing

Bag WeightSmall: 2lb 8oz / 1.13kg / Reg: 2lb 12oz / 1.25kg / Long: 3lb / 1.36kg
Fill WeightSmall: 21.5oz / 610g / Reg: 23.5oz / 666g / Long: 25.5oz / 723g
Compressed Bag SizeSmall: 6in x 7in / 15 x 18cm / Reg: 7in x 8in / 18 x 20cm / Long: 7in x 8in/ 18 x 20cm
Stuff Sack SizeSmall: 9in x 20in / 23 x 51 c/ Reg: 9in x 20in / 23 x 51 cm / Long: 9in x 20in / 23 x 51cm


Design improves connection between pad sleeve and bag providing a roomier sleeping space without adding bulk

Sculpted contour allows the bag to drape around you, increasing insulation performance

Free Range Hood design gives you the freedom to lift your head while snuggled in the hood

Low profile cordlock lets you un-cinch the hood with one hand

Stretch fabric panel beneath hood creates a designated pillow pocket

DownTek™ water repellent down repels water while maintaining insulating value

Zipper Garage

Mate together left and right zip bags within a series

No-draft collar, No-draft wedge, No-draft zipper

Interior fabric loops for sleeping bag liners

Exterior loops for hang drying or storage

Mesh storage sack & nylon stuff sack

Construction + Materials

Superlight Nylon rip-stop shell fabric with high tear strength and a water repellent finish 

Nylon Taffeta lining

Insotect Flow™ construction

Tapered vaulted foot box creates wiggle room for your feet with out creating large cold air pockets 

 850 fill DownTek™ water repellent down 

Integrated full pad sleeve

Rectangular shaped bag

70" / 178cm YKK #5

Here’s what other people think.

What’s in a Name?

The Blackburn mine was a dominant and fruitful gold mine located in the Hahns Peak region of the Yampa Valley. Paired with the El Capitan and Ben Harrison Placers mines, the discovery of gold in the area in 1862 established the Hahns Peak region as part of Colorado's gold rush.