Feathered Friends Hummingbird UL 20
Specifications
| Weight | Packed Size (L) | Warmth Rating | Fill Weight | Fill Power | Fill Type | Sleeper Height | Seasons | Shape | MSRP |
|---|---|---|---|---|---|---|---|---|---|
| 1 lb 8 oz | 9 | 20°F | 14 oz | 950+ | Goose Down | Up to 6 ft (Regular) | 3-season | Slim Mummy | $609.00 |
Comfort & Warmth
The Feathered Friends Hummingbird UL 20 is designed for ultralight purists who want maximum thermal efficiency in the smallest, lightest package possible. With a trim, narrow mummy cut and premium 950+ fill power goose down, it delivers impressive warmth for its 20 °F rating while minimizing bulk and weight. The 10-denier Pertex Endurance UL shell provides light weather resistance without compromising breathability, and an overstuffed passive collar helps seal in heat despite the absence of a dedicated draft collar. Its close-fitting design reduces dead air space, making it highly efficient in cold conditions, though it offers less interior room than more relaxed cuts like the Feathered Friends Swallow UL 20. For experienced backpackers who prioritize warmth-to-weight performance over extra space, the Hummingbird UL 20 offers a snug, reliable sleep system built to excel in demanding backcountry conditions.
Weight & Packability
The Hummingbird UL 20 is purpose-built for ultralight backpackers, tipping the scales at just 1 lb 8 oz (regular length) while still packing in 14 oz of premium 950+ fill power goose down for exceptional loft and warmth. It pack in a remarkably small 9 liter volume in its included stuff sack (can be compressed further), making it one of the most packable 20 °F-rated bags on the market and a favorite for thru-hikers who need to maximize space in smaller packs. The 10-denier Pertex Endurance UL shell and streamlined, narrow cut help shave every possible gram without sacrificing performance. While its trim profile makes it less forgiving for sleepers who like to sprawl, it excels for ounce-counters who value a warm, highly compressible bag that disappears into the corner of their pack yet stands ready for frigid nights in the backcountry.
Price
The Hummingbird UL 20 retails for $609 in the regular length, positioning it among the most premium ultralight mummy bags available. This price reflects the use of ethically sourced, RDS-certified 950+ fill power goose down, a 10-denier Pertex Endurance UL shell, and meticulous handcrafting in Seattle - materials and construction that deliver exceptional warmth-to-weight performance and long-term durability. While significantly more expensive than mass-market sleeping bags, the Hummingbird UL 20 is built to outperform and outlast cheaper alternatives, often serving as a long-term investment for serious backcountry travelers. For ultralight enthusiasts and thru-hikers who prioritize minimal pack weight without compromising warmth or build quality, the higher price is positioned not as a luxury but as the cost of owning one of the lightest, most thermally efficient 20 °F bags on the market.
Quality & Materials
This bag is built with an uncompromising focus on performance, durability, and weight savings, making it their lightest full-featured mummy bag to date. Handcrafted in Seattle, it uses a water-resistant 10-denier Pertex Endurance UL shell that offers an excellent balance of weather protection and breathability, paired with a soft, 15-denier Flite ripstop nylon lining for next-to-skin comfort. Its insulation is premium RDS-certified 950+ fill power goose down, chosen for its exceptional loft, warmth retention, and resilience even after years of use. Continuous baffle construction allows the down to be shifted for customized warmth distribution, while the trapezoidal footbox, overstuffed passive collar, draft tube, and 3D hood design work together to maximize heat retention and eliminate cold spots. Every stitch and seam reflects the brand’s attention to detail, ensuring that the bag maintains its performance and appearance through demanding thru-hikes and alpine expeditions. This combination of elite materials, precise construction, and ultralight design positions the Hummingbird UL 20 as one of the highest-quality 20 °F sleeping bags available.
Consumer Sentiment: Pros & Cons
Pros:
- Remarkable warmth-to-weight ratio,
- Highly compressible, making it pack into very small volume
- Great build quality, from the zipper to overall craftsmanship
Cons:
- Premium price may be a barrier
- Slim mummy cut may feel tight for broader builds
Comparison to Comparable Bags
Feathered Friends Swallow UL 20: Compared to the Swallow UL 20, the Hummingbird UL 20 is narrower and lighter, offering greater thermal efficiency but less interior space and versatility for different sleeping styles.
Western Mountaineering MegaLite 30: While the MegaLite is roomier and more comfortable for side sleepers, the Hummingbird UL 20 is warmer, more weather-resistant, and uses higher-fill down for better cold-weather performance.
Feathered Friends Tanager 20 CFL: The Hummingbird UL 20 offers a full-length zipper, draft protection, and more versatility than the ultralight, zipperless Tanager 20 CFL, which is even lighter but far more minimalist.
Who It’s Intended For
The Feathered Friends Hummingbird UL 20 is intended for ultralight backpackers, and thru-hikers who prioritize the lowest possible weight and maximum thermal efficiency over extra interior space or comfort features. It’s best suited for experienced users who sleep well in a narrow mummy cut, need a dependable 20 °F bag for cold nights in the backcountry, and value high-end materials and long-term durability in an ultralight package.
