The Blackburn UL 0 is one of our most technically designed Big Agnes System bags, using our Flex Pad Sleeve design, a very durable nylon ripstop 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 is important, this is the go-to bag for you.

• Features The lightest Big Agnes System bags offer technical, roomy sleeping spaces for those who aren't willing to sacrifice comfort or compressibility Streamlined silhouette for increased thermal efficiency Flex Pad Sleeve features stretch construction that accommodates multiple pad widths, and easily connects your bag to your pad Small, Regular and Long bags fit 20" - 25" wide pads Free Range Hood gives you the freedom to lift your head. Jacket-style hood opening contours to the shape of your face for a comfortable, snug fit Rectangular shaped bag DownTek - a water repellent down that uses a PFC-Free, bluesign approved chemistry. Anti-snag zipper for a smooth, quick zip Zipper Garage Mate together left and right zip bags 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 & polyester ripstop stuff sack Small: 60" / 152cm YKK #5 anti-snag locking zipper Regular: 65" / 165cm YKK #5 anti-snag locking zipper Long: 70" / 178cm YKK #5 anti-snag locking zipper