The world's most in-depth and scientific reviews of outdoor gear

Feathered Friends Swallow 20 YF Review

Our favorite zipper and hood in a bag that's also exceptionally warm and lofty.
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Price:  $450 List | $389.00 at Feathered Friends
Pros:  Best-in-class zipper, best-in-class hood, awesome loft, great warmth-to-weight ratio
Cons:  Narrow leg dimensions, no draft collar, heavier and bulkier than some 3-season options
Manufacturer:   Feathered Friends
By Jack Cramer ⋅ Review Editor  ⋅  May 7, 2019
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76
OVERALL
SCORE


RANKED
#4 of 14
  • Warmth - 20% 9
  • Weight - 20% 7
  • Comfort - 20% 7
  • Packed Size - 15% 7
  • Versatility - 15% 8
  • Features & Design - 10% 7

Our Verdict

The Swallow, like its avian namesake, isn't flashy or boastful. Instead, it exhibits an understated grace that's increasingly rare in our 21st-century world. The sleeping bag version also includes exceptional loft and a spartan design that produce an outstanding warmth-to-weight ratio. Our testers proclaimed its full-length zipper their favorite due to its multiple anti-snag measures. The hoods of the Swallow and other Feathered Friends bags are also the most comfortable we've tried.

Our complaints are minor. It's heavier and bulkier than average, but we largely excuse this because it's also a lot warmer than average. The warmth could be improved, however, with the addition of a draft collar to seal in heat when temperatures are near its 20°F rating. The Western Mountaineering UltraLite ultimately won our Top Pick Award for colder 3-season conditions because it includes such a collar.


Compare to Similar Products

 
Awards  Editors' Choice Award Top Pick Award Top Pick Award Best Buy Award 
Price $389.00 at Feathered Friends$470.00 at Backcountry
Compare at 2 sellers
$429.00 at Feathered Friends$510.00 at Backcountry
Compare at 2 sellers
$199.95 at REI
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Pros Best-in-class zipper, best-in-class hood, awesome loft, great warmth-to-weight ratioSpacious dimensions, super comfortable, great loft, lightweight, made in the USASuper lightweight, incredible loft, snag-proof zipper, cozy hoodBest-in-class warmth, legit draft collar, light weight, exceptional loftAwesome warmth-to-weight ratio for the price, very compressible, tons of venting options, nice compression sack included
Cons Narrow leg dimensions, no draft collar, heavier and bulkier than some 3-season optionsExpensive, awkward hood, good but not great zipperUncomfortably narrow dimensions, bare-bones design, noisy fabricReally pricey, kind of bulky, awkward hood closureNot as warm as its temp rating, no draft collar, uncertain durability
Bottom Line Our favorite zipper and hood in a bag that's also exceptionally warm and lofty.The only ultra-premium bag to combine low weight, good packability, and luxurious comfort.Our favorite when ounces matter, this is a full-size mummy bag that's both warm and ultralight.A ultra-premium bag that's our favorite for cold nights in spring and fall.An exceptional deal for a lightweight bag that excels in wet conditions.
Rating Categories Swallow 20 YF MegaLite Hummingbird UL 30 UltraLite NEMO Kyan 35
Warmth (20%)
10
0
9
10
0
8
10
0
8
10
0
10
10
0
3
Weight (20%)
10
0
7
10
0
8
10
0
9
10
0
7
10
0
7
Comfort (20%)
10
0
7
10
0
9
10
0
7
10
0
7
10
0
7
Packed Size (15%)
10
0
7
10
0
8
10
0
8
10
0
6
10
0
9
Versatility (15%)
10
0
8
10
0
7
10
0
8
10
0
8
10
0
9
Features & Design (10%)
10
0
7
10
0
7
10
0
7
10
0
7
10
0
8
Specs Swallow 20 YF MegaLite Hummingbird UL 30 UltraLite NEMO Kyan 35
Insulation 900+ FP Down 850+ FP Down 950+ FP Down 850+ FP Down Synthetic - Primaloft Silver
Compressed Volume (L) 8.5 L 7.2 L 7.3 L 8.7 L 6.6 L
Measured Bag Weight (Size Long) 1.94 lbs 1.62 lbs 1.45 lbs 1.86 lbs 1.89 lbs
Compression/Stuff Sack Weight (oz) 1 oz 1.6 oz 0.8 oz 1.6 oz 2.4 oz
Manufacturer claimed weight of size Regular (lbs) 1.79 lbs 1.5 lbs 1.33 lbs 1.81 lbs 1.69 lbs
Hydrophobic down No No No No N/A
Manufacturer Temp Rating (F) 20 30 30 20 35
EN Temp Rating (Lower Limit) Not rated Not rated Not rated Not rated 35
Fill Weight (oz) 17.5 13 12 17 12
Shell material Pertex YFuse (20D) Extremelite (12D) Pertex Endurance (10D) Extremelite (12D) Ripstop nylon (20D)
Neck Baffle No No No Yes No
Small Organization Pocket No No No No Yes
Zipper Full-length / Side Full-length / Side Full-length / Side Full-length / Side 3/4-length / Side
Shoulder Girth (in) 60 64 58 59 62
Hip Girth (in) 56 Unknown 52 Unknown 57
Foot Girth (in) 38 39 38 38 46
Compression or stuff sack included? Stuff Stuff Stuff Stuff Compression

Our Analysis and Test Results

Like a lot of Feathered Friends sleeping bags, the Swallow is available in 'UL' or 'YF' versions. The difference between the two is the type of shell fabric. UL stands for ultralight and uses 10-denier Pertex Endurance to shave an ounce or off the total bag weight. YF stands for YFuse and relates to the Y-shaped filaments in its 20-denier Pertex Quantum that supposedly improve its long-term downproofing and water resistance. The Swallow we tested was a YF version and the Hummingbird was a UL. Although the water resistance benefits of the YF fabric were hard to perceive, we preferred it over the UL because the UL fabric makes a crinkling noise that annoyed some testers.

Performance Comparison


The Feathered Friends Swallow is an awesome sleeping bag. Its exceptional loft and 20F rating are ideal for "cold sleepers" or cooler nights in spring and fall.
The Feathered Friends Swallow is an awesome sleeping bag. Its exceptional loft and 20F rating are ideal for "cold sleepers" or cooler nights in spring and fall.

Warmth


Feathered Friends gives the Swallow a 20°F temperature rating. They choose not to have it rated on the industry-standard EN test, but our testers believe its warmth exceeds the manufacturer's rating and is comparable to the average bag with an EN lower limit rating between 10° and 15°.

It achieves this substantial warmth using 17.5 ounces of super lofty, 900+ fill power down. This is a half-ounce more and 50 fill power better insulation that the Western Mountaineering UltraLite. We consider that bag a little warmer, however, because it has a substantial draft collar and the Swallow does not. Both bags are still ideal for colder 3-season conditions.

The Swallow doesn't have a neck baffle but its snap closure is simple  light  and effective at keeping it closed. We preferred it over the Western Mountaineering velcro closures.
The Swallow doesn't have a neck baffle but its snap closure is simple, light, and effective at keeping it closed. We preferred it over the Western Mountaineering velcro closures.

Weight


This bag weighed in at 1.89 pounds on our scale for a size long. Although that's about average for our backpacking sleeping bag review, the warmth of this bag is way above average. This means its more important warmth-to-weight ratio is a lot better than most.

Comfort


The Swallow has some of the loftiest down we've seen. The hood design, with the drawstring set back from the opening, also fits better than that of its Western Mountaineering rivals. We consider the Western Mountaineering MegaLite more comfortable overall though because its dimensions are noticeably wider. The Swallow has a pretty roomy torso and hip areas but gets narrow at the feet. The awesome loft of its down still makes it cozier than the average bag, but wider mummy-style bags or the hourglass-shaped offerings from Nemo are more comfortable.

The Feathered Friends Swallow stuffed in an after-market compression sack (left) and the stuff sack that it comes with (right).
The Feathered Friends Swallow stuffed in an after-market compression sack (left) and the stuff sack that it comes with (right).

Packed Size


This bag comes with a simpler drawstring stuff sack. Although this sack weighs just an ounce, it's not effective at compressing the bag to its minimum volume. Using an after-market compression sack, we measured its minimum volume at 8.5 liters. This is toward the upper end of our 3-season backpacking sleeping bag category, but much better when you factor in the bag's substantial warmth. Its 8.5-liter packed size is also much smaller than most backpacking sleeping bags in the budget category.

Versatility


The big advantage in versatility most high-end down bags like the Swallow share is their continuous horizontal baffles. This means that their down insulation is contained with fabric tubes, or baffles, that are perpendicular to the length of the bag and uninterrupted. With this kind of construction, you can move feathers from the top to the underside of the bag to adjust the amount of insulation covering your body. After some practice, it's possible to calibrate the warmth to match conditions.

Bags with truly full-length zippers  like the Feathered Friends Swallow  can be zipped open to share as a quilt on really cold mornings.
Bags with truly full-length zippers, like the Feathered Friends Swallow, can be zipped open to share as a quilt on really cold mornings.

Until you have that dialed in, the Swallow also has a full-length zipper for venting excess heat. This long zipper also lets you open the bag fully for sharing as a quilt.

Features and Design


This is a pretty basic mummy bag that doesn't include a stash pocket or neck baffle. Of the few features that it does have, the one that we absolutely love is the zipper. Like the other Western Mountaineering and Feathered Friends bags, there's a strip on flexible plastic inside the fabric next to the zipper. This gives that fabric important stiffness that keeps it away from the zipper's teeth.

The Y-shaped slide and strip of internal plastic combine to make the Swallow's zipper virtually snag-proof.
The Y-shaped slide and strip of internal plastic combine to make the Swallow's zipper virtually snag-proof.

The Feather Friends bags also have Y-shaped zipper slides that further reduce the chance of snagging. Finally, the button closure at the top-end of the zipper is simple but effective. Although the Swallow's overall design is spartan, we think the extra zipper features are smart and worth their weight.

Best Applications


If summer is your main season, this bag's warmth down to 20°F is probably unnecessary. But if you consistently like to get out in spring and fall it should be ideal. The low weight and small packed size relative to the warmth will also be appreciated on long trips into the deep backcountry.

Value


This bag ain't cheap. Its $449 list price, however, is a little lower than many other ultra-premium down bags. We also expect most ultra-premium down bags to have excellent longevity because their higher quality feathers seem to maintain their loft better through repeated compression cycles. Thus, over the full life of this bag, we believe it's a great value.

Conclusion


All the Feathered Friends and Western Mountaineering bags impressed us with their high loft, good build quality, and exceptional warmth-to-weight ratios. The Swallow is no exception. But they can't all be award winners. This bag missed out because we ultimately concluded that the 30°F bags—the Western Mountaineering MegaLite and Feathered Friends Hummingbird—are better for most 3-season temperatures and the neck baffle on the Western Mountaineering UltraLite gives it superior colder weather performance. The competition, however, was incredibly close. If you personally prefer no neck baffle and consider an awesome zipper important, the Swallow might be the perfect bag for you.


Jack Cramer