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Feathered Friends Hummingbird UL 30 Review

Our favorite when ounces matter, this is a full-size mummy bag that's both warm and ultralight
Feathered Friends Hummingbird UL 30
Photo: Feathered Friends
Top Pick Award
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Price:  $459 List | $459.00 at Feathered Friends
Pros:  Super lightweight, incredible loft, snag-proof zipper, cozy hood
Cons:  Uncomfortably narrow dimensions, bare-bones design, noisy fabric
Manufacturer:   Feathered Friends
By Jack Cramer ⋅ Review Editor  ⋅  May 7, 2019
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79
OVERALL
SCORE


RANKED
#2 of 21
  • Warmth - 20% 8
  • Weight - 20% 9
  • Comfort - 20% 7
  • Packed Size - 15% 8
  • Versatility - 15% 8
  • Features & Design - 10% 7

Our Verdict

Interested in shedding some weight from your overnight kit? The Feathered Friends Hummingbird UL 30 is a great way to start. Weighing in at just 1 lb 5 oz, it's one of the lightest 3-season mummy bags out there. That's no trick either. It really is a 3-season bag and will keep you warm down to at least its 30°F temperature rating. Through some form of wizardry, it also attains this low weight while still including a sturdy full-length zipper that's immune to snagging. Combine this all together and there's no mystery why it took home our Top Pick Award for Light and Fast Adventures.

Its Achilles' heel, however, is sub-par comfort. That's because it uses particularly narrow dimensions to trim the ounces. This isn't a problem if you don't mind being confined inside lofty down heaven. But if you hope to be able to stretch your legs, a more roomy model might be a better choice.

Product Renamed

When we tested this bag, Feathered Friends referred to it as the Merlin 30 UL but they have since renamed it the Hummingbird UL 30. The two bags are identical. We link to the Hummingbird 30 in this review.

July 2019

Compare to Similar Products

 
Awards Top Pick Award Editors' Choice Award Best Buy Award Best Buy Award Best Buy Award 
Price $459.00 at Feathered Friends$485 List
Check Price at Backcountry
$399.95 at Backcountry
Compare at 2 sellers
$200 List
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$100 List
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Overall Score Sort Icon
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Pros Super lightweight, incredible loft, snag-proof zipper, cozy hoodSpacious dimensions, super comfortable, great loft, lightweight, made in the USASpacious, decent warmth-to-weight ratio, reasonable priceDecent weight, respectable warmth, awesome bargainGreat price, respectable weight, simple design
Cons Uncomfortably narrow dimensions, bare-bones design, noisy fabricExpensive, awkward hood, good but not great zipperBulky, ineffective hood closure, limited versatilityAverage materials, limited features, basic designSubpar warmth, annoying hood drawcords, no storage sack, mediocre versatility
Bottom Line Our favorite when ounces matter, this is a full-size mummy bag that's both warm and ultralightThe best ultra-premium bag that combines warmth, low weight, good packability, and luxurious comfortA mid-range double bag for weight-conscious and comfort-seeking adventure pairsAn exceptional deal for a capable and sturdy backpacking sleeping bag for those looking to get outside without breaking the bankAn acceptable sleeping bag at a rock bottom price
Rating Categories Hummingbird UL 30 MegaLite Big Agnes Sentinel... Bishop Pass 30 REI Co-op Trailbrea...
Warmth (20%)
8.0
8.0
5.0
6.0
5.0
Weight (20%)
9.0
8.0
7.0
6.0
3.0
Comfort (20%)
7.0
9.0
7.0
6.0
6.0
Packed Size (15%)
8.0
8.0
8.0
8.0
5.0
Versatility (15%)
8.0
7.0
4.0
6.0
7.0
Features & Design (10%)
7.0
7.0
7.0
6.0
6.0
Specs Hummingbird UL 30 MegaLite Big Agnes Sentinel... Bishop Pass 30 REI Co-op Trailbrea...
Insulation 950+ FP Down 850+ FP Down 650 FP Down 650 FP Down, RDS-certified Synthetic - Polyester
Compressed Volume (L) 7.3 L 7.2 L 11.2 L 7.5 L 9.8 L
Measured Bag Weight (Size Long) 1.45 lbs 1.62 lbs 3.25 lbs (size regular) 1.98 lbs 2.74 lbs
Manufacturer claimed weight of size Regular (lbs) 1.33 lbs 1.5 lbs 3.5 lbs 1.79 lbs 2.5 lb
Compression/Stuff Sack Weight (oz) 0.8 oz 1.6 oz 1.4 oz 1.6 oz 1.2 oz
Hydrophobic down No No Yes No N/A
Manufacturer Temp Rating (F) 30 F 30 F 30 F 30 F 30 F
EN Temp Rating (Lower Limit, F) Not rated Not rated Not rated 30 F 29 F
Fill Weight (oz) 12 oz 13 oz 19.5 oz 15 oz 21.1 oz
Compression or stuff sack included? Stuff Stuff Stuff sack Stuff sack Stuff
Shell material Pertex Endurance (10D) Extremelite (12D) Polyester ripstop 20D Nylon Ripstop Polyester w/ DWR
DWR? Yes No Yes Yes No
Liner material n/a n/a Polyester taffeta 30D Plain weave nylon Polyester
Neck Baffle No No Yes No No
Small Organization Pocket No No No Yes Yes
Zipper Full-length / Side Full-length / Side Dual 3/4-length 3/4-length / Left Side 3/4-Length / Left Side
Shoulder Girth (in) 58 64 105 62 62
Hip Girth (in) 52 Not stated 105 53 56
Foot Girth (in) 38 39 84 Not stated

Our Analysis and Test Results

The Hummingbird is almost magical for the warmth and comfort it provides in such a lightweight package. Although it ultimately missed out on the Editors' Choice Award, it still deservedly earns our Top Pick for Light and Fast Adventures. The competition was extremely close so it's vital to weigh the pros and cons of our top-rated bags to ensure you pick the perfect one for you.

Performance Comparison


Recording our thoughts during a field test with the Feathered...
Recording our thoughts during a field test with the Feathered Friends Hummingbird.
Photo: Jack Cramer

Warmth


The Hummingbird UL contains 12 ounces of ultra-premium, 950+ fill-power, goose down. Although this is a little less insulation than other primo bags with similar temperature ratings, it has a narrow fit that requires less material to provide the same amount of warmth.


Feather Friends does put their sleeping bags through formal EN temperature

testing. Instead they supply their own manufacturer rating for the Hummingingbird of 30°F. We felt it provided similar warmth compared to the average bag that receives an EN lower limit rating of 20°F. With this level of insulation, it's an excellent middle-of-the-road bag that's well-suited for all but the coldest or warmest 3-season uses.

The Hummingbird's 30F rating is generous compared to other bags. We...
The Hummingbird's 30F rating is generous compared to other bags. We think it's warm enough for cold spring and fall nights.
Photo: Jack Cramer

Weight


Weighing in on our scale at 1.45 pounds for a size long, the Hummingbird UL is truly ultralight. This is made all the more impressive when you consider its substantial insulation and sturdy, full-length zipper that provide significant warmth and versatility, respectively.


On paper, their are a few bags with reported weights and temperature ratings that would seem to offer even better warmth-to-weight ratios than the Hummingbird. Our testers, however, found many of the temperature ratings on these competing bags to be overly optimistic. The Hummingbird's insulation, in contrast, felt much warmer than its 30° rating. We, thus, consider this bag to be the top bag in warmth-to-weight ratio and have trouble attributing this outstanding performance to something other than sorcery.

Comfort


Our only significant complaint with this bag is its comfort. Don't get us wrong, the fabric is soft, and the incredible loft of its ultra-premium down creates an extremely cozy cocoon. Rather, our comfort complaint is due to its narrow fit.


With 58 inches of shoulder girth, the Hummingbird is one of the narrowest bags we tested. Virtually all of our testers are happy inside bags that are 64 inches wide, but as the girth shrinks complaints steadily rise. Our larger and side sleeping reviewers, in particular, said the Hummingbird felt constrictive. This probably isn't a problem for shorter trips, when the benefits of less weight can overshadow the drawbacks in comfort. However, for longer trips, or over the full lifetime of a bag, the review team felt that the average user would likely prefer a wider design.

For some sleeping styles, the comfort difference between a narrow...
For some sleeping styles, the comfort difference between a narrow bag like the Feathered Friends Hummingbird (orange) and a wider bag can be substantial.
Photo: Jack Cramer

A smaller complaint about the Hummingbird's comfort related to the nosiness of its Pertex Endurance shell fabric. When manipulated, this fabric creates a distinct crinkling sound. Although it's only subtly louder than most other bags, some lighter sleepers felt the difference was enough to disturb their sleep.

Packed Size


Like its low weight would suggest, this bag packs down pretty small. With the help of an aftermarket compression sack, it achieved an impressive 7.3 liters in compressed volume. This is slightly larger than some bags with less insulation, but nearly identical to any other bag offering a similar level of warmth.


The simple drawstring stuff sack this bag comes with is ultralight, at just 0.8 oz, but not super effective at compression. To fully enjoy the Hummingbird's small packed size you will need to get a third-party compression sack. This will set you back an extra twenty bucks but will shrink its packed size by roughly 20%.

The Hummingbird is pretty bulky packed inside the yellow stuff sack...
The Hummingbird is pretty bulky packed inside the yellow stuff sack that it comes with. A good compression sack, however, can compress it considerably smaller.
Photo: Jack Cramer

Versatility


The Feather Friends bags we tested feature some of the longest zippers in the backpacking sleeping review. These allow the Hummingbird to vent excess heat as well as any other bag we tried, expanding the range of temperatures it can comfortably be used in. When opened fully, the long zipper also effectively turns the bag into a quilt for sharing on a chilly morning or between climbing partners during a "light and fast" bivouac.


Its one versatility drawback is its down insulation. Like all down products, this down will lose its ability to insulate if it gets wet. Thus, this bag is not well-suited for particularly wet climates or activities.

Continuous horizontal baffles allow you to move feathers to the top...
Continuous horizontal baffles allow you to move feathers to the top or underside of a bag to adjust the amount of insulation.
Photo: Jack Cramer

Features and Design


Although it's just a simple mummy bag, we like this bag's features and design. The zipper, as we mentioned above, is super long for venting excess heat.


It also incorporates an effective anti-snag zipper slide. The fabric adjacent to this zipper is stiffened by an internal strip of flexible plastic that further reduces the likelihood that fabric will get caught in the zipper's teeth.

The Feathered Friends bags that we tried feature a Y-shaped zipper...
The Feathered Friends bags that we tried feature a Y-shaped zipper slide and an internal strip of flexible plastic to prevent the zipper from snagging.
Photo: Jack Cramer

We also prefer the hood design on this and other Feathered Friends bags compared to some of their closest rivals. Placing the hood's drawstring slightly back from the hood opening creates a cozy tube of insulation around the face that our testers found to be warmer and more comfortable.

The snap that seals the Hummingbird may be simple but it's easy to...
The snap that seals the Hummingbird may be simple but it's easy to snap and effective at keeping it closed.
Photo: Jack Cramer

Value


Although the Hummingbird certainly isn't cheap, it does cost a little less than similarly performing bags. If you're going to spend several hundred dollars on an ultra-premium sleeping bag, however, this meager savings probably isn't worth factoring into your decision. Instead, simply choose the ultra-premium bag that's best suited for your sleeping style and expected applications. Whether that's the Hummingbird or one of its competitors, you will receive an expensive bag that still provides an exceptional value because it can last for over a decade.

The Hummingbird is our favorite backpacking sleeping bag for when we...
The Hummingbird is our favorite backpacking sleeping bag for when we want to go light. Pair it with a backpacking tarp to really trim the weight of your overnight kit.
Photo: Jack Cramer

Conclusion


The Feathered Friend Hummingbird's greatest strength is its incredible warmth-to-weight ratio. We also think the long, anti-snag, zipper performs better than any other, giving this bag an edge in convenience and versatility. However, the narrow dimensions that contribute to this bag's low weight come with drawbacks for its comfort. Larger and side-sleeping testers found these dimensions to be uncomfortably constrictive. The Hummingbird is thus our Top Pick for users interested in "fast and light" missions where sacrificing some comfort for lower weight is often worth it. The average backpacker, however, may prefer a slightly heavier bag with more roomy dimensions.

Jack Cramer