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10 Best Ultralight Sleeping Bags of 2023

10 Best Ultralight Sleeping Bags

Many ultralight sleeping bags are as lightweight as backpacking quilts, making them a viable component in an ultralight backpacking sleep system. Sleeping bags also have the advantage over quilts in that they are draft free because they can be zippered closed at night and because there are no pad attachment straps to mess around with in the dark. Many ultralight sleeping bags are also available without mummy hoods and can be easily vented, providing all of the comfort advantages of backpacking quilts for people who prefer hoodless sleep insulation.

Make / ModelTypeWeight
Feathered Friends Flicker 40Hoodless18.5 oz / 525g
Enlightened Equipment Convert 40Hoodless17.73 oz / 503g
Western Mountaineering Flylite 36Mummy14.25 oz / 404g
Sea-to-Summit Spark 40Mummy12 oz / 340g
Western Mountaineering Summerlite 32Mummy19 oz / 539g
Western Mountainering Highlite Mummy16 oz / 454g
Therm-a-Rest Ohm 20Hoodless22 oz / 624g
Therm-a-Rest Hyperion 20Mummy20 oz / 567g
Feathered Friends Tanager 20Hoodless18.6 oz / 527g
Zpacks Mummy Sleeping Bag 20Mummy22 oz / 625g

Here are the 10 best ultralight sleeping bags that we recommend:

1. Feathered Friends Flicker 40

Feathered Friends Flicker UL Quilt Sleeping Bag
The Feathered Friends Flicker 40 UL Quilt Sleeping Bag is a 19-ounce quilt sleeping bag designed for backpackers and climbers who want the flexibility and light weight of an insulated sleep system that can be used as a hoodless sleeping bag, an ultralight quilt, or a blanket. It has a full-length zipper, draft collar, and ventable foot box and is insulated with 950 fill power goose down making it highly compressible for packing. Read the SectionHiker Flicker Review.

Shop at Feathered Friends

2. Enlightened Equipment Convert 40 Sleeping Quilt

Enlightened Equipment Convert Sleeping Quilt

The Enlightened Equipment Convert features a full-length zipper and a fully adjustable and ventable footbox which allows it to be completely closed (like a sleeping bag), completely open (like a blanket), or somewhere in between. It’s available with 850 or 950 fill power down, a draft collar, different lengths and widths, and a wide variety of colors and fabric weights. For example, a 40-degree 850-fill power read-to-ship Convert Sleeping Bag weighs just 20.52 oz. Read the SectionHiker Convert Review.

Shop at Enlightened Equip.

3. Western Mountaineering Flylite 36

WM Flylite Sleeping Bag
Designed thru-hikers, trail runners, and bike packers, the Western Mountaineering Flylite 36F/2C is a fully baffled (i.e. no quilted/sewn through construction) 14.25 oz down sleeping bag with 850+ goose down, a 10 denier liner and shell, and a super light #3 YKK half zipper that packs down to the size of a Nalgene bottle. Complete with a zipper draft tube, and an insulated collar, it is available in multiple lengths.
Shop at Backcountry

4. Sea-to-Summit Spark 40 Sleeping Bag

Sea-to-Summit Spark 40
The Sea-to-Summit Spark 40 sleeping bag is exceptionally lightweight, only weighing 12 oz. The Spark is insulated with 850+ fill-power Premium Goose UltraDry Down with superlight 7-denier and 10-denier shell and lining fabrics that offer minimal weight and packed size. The Spark has a contoured mummy shape that provides comfort and efficient insulation, with vertical chest baffles to prevent down migration. A 1/3 length zipper helps reduce the bag’s weight while the contoured footbox helps eliminate cold spots and keeps feet warm. With a compressed volume of 1.5L, the Spark packs up very small, making it perfect for those trips where storage space is at a premium.

Shop at Sea-to-Summit

5. Western Mountaineering Summerlite 32

Western Mountaineering Summerlite 32
At just 1 lb 3 oz., the SummerLite is the lightest bag Western Mountaineering makes in a continuous baffle construction, so you can shift the down to where you need it most. Weighing only 19 ounces, this fully-baffled bag has a full-length, two-way #5 YKK zipper so you can vent the footbox or the top of the bag. It also has a zipper draft tube and tape stiffener to prevent fabric snags. It is insulated with 10 oz of 850+ fill power goose with a 4″ loft. The Summerlite is a bit snug however in the chest and is best used by people with a smaller stature.

Shop at Backcountry

6. Western Mountaineering Highlight 35 Sleeping Bag

Western Mountaineering Highlight 35 Sleeping Bag
The Western Mountaineering Highlite 35 is a 16 oz sleeping bag optimized for compressibility and ultralight weight. It has a super lightweight shell fabric and a one-way #4 1/2 YKK coil zipper that is cut to half-length to save weight. Its down insulation is held in a combination of sewn-thru and boxed baffles with 1 1/2? netting to allow unimpeded loft so the effect of its 850+ goose down is fully realized. With a 59?/38? Shoulder/Foot Girth fit, it’s cut snugly to reduce bulk and weight, while reducing excess internal volume so quick heating is realized.

Shop at Backcountry

7. Therm-a-Rest Ohm 20 Sleeping Bag

Thermarest Ohm 20
The Therm-a-Rest Ohm 20 is a hoodless sleeping bag insulated with 900 fill power hydrophobic goose down that weighs 1 pound 6 ounces (652 g). It is box-baffled and has a full-length, two-way side zipper with a draft tube, a puffy draft collar, with a silky 10d nylon/ripstop shell. In warmer weather, the Ohm can be unzipped and used as a blanket or quilt. Read the SectionHiker Ohm 20 Review.

Shop at Therm-a-Rest

8. Therm-a-Rest Hyperion 20 Sleeping Bag

Hyperion 20
Therm-a-Rest Hyperion 20 is an ultralight down sleeping bag designed for back sleepers that weighs 20 ounces (1 lb 4 oz) and is insulated with 900 fill power waterproof down. It has a box-baffled construction to eliminate cold spots and a half-length zipper to save weight. When stuffed the Hyperion 20 packs down to just 3L making it perfect for trips where pack space is at a premium. Read the SectionHiker Hyperion 20 Review.

Shop at Therm-a-Rest

9. Feather Friends Tanager 20 Sleeping Bag

The Feather Friends Tanager 20 Sleeping Bag is a hoodless, full-length, and zipperless sleeping bag designed for thru-hikers, ultralight backpackers, and alpinists who want to minimize their gear weight and bulk. Weighing 18.6 oz, the Tanager is insulated with 12.6 oz of 950 fill power goose down and is best viewed as a specialized, ultralight alternative to a 20-degree backpacking quilt or mummy sleeping bag. Read the SectionHiker Tanager 20 Review.

Shop at Feathered Friends

10. Zpacks Mummy Sleeping Bag 20

Zpacks Mummy Sleeping Bag 20
The Zpacks Mummy Sleeping Bag has a hood and a full-length 2-way side zipper with an integrated draft tube and zipper guard to keep it draft-free. The zipper wraps around the footbox allowing you to open the bag flat like a blanket or to simply unzip the bottom to kick your feet out if you get too hot. Vertical baffles on the upper body keep down from migrating to the sides. There are no “sewn-through” seams. The bag includes a zipper draft tube and snag guard to prevent ripping the shell. There’s also a draw cord at the neckline to seal out drafts. The bag is also overstuffed by 30% to prevent down compression over time, and insulated with 900 fill power treated (DWR) down.

Shop at Zpacks

Ultralight Sleeping Bag Guide

Here is a list of key considerations when deciding between different ultralight sleeping bag options.

Mummy or Rectangular (Hoodless) Sleeping Bags?

Ultralight sleeping bags are available with mummy hoods or as hoodless rectangular bags, similar to quilts. Which you choose is a matter of personal preference, but a mummy hood can be a real bonus in colder temperatures when more head insulation is warranted. When sleeping in a hoodless sleeping bag, you’ll want to use some sort of head covering, like a fleece or down cap, or sleep in a puffy down jacket with a hood to keep you head warm and seal out drafts at the top of the bag.

Must-have Features

Ultralight sleeping bags should have a draft collar, zipper draft tubes, and snag-free zippers at a minimum. Partial-length zippers, continuous baffles, and even water-resistant down are all nice-to-haves, but you can get by without them to save on cost or because they’re not strictly necessary.

Draft Collar

Most high-quality ultralight sleeping bags have draft collars which is an important feature on bags rated for 20 degrees F or colder. A draft collar is a tube of insulation that drapes over your chest and neck and seals in the bag’s warmth. Without it, the warm air inside the bag will rush out around your neck when you move around inside. The simplest draft collar is a down tube that covers the front of your chest. Higher-end bags add a second draft collar around the back of your shoulders and neck and provide additional controls, so you can tighten or loosen it.

Zipper Draft Tubes

Draft tubes are down-filled tubes of fabric that cover up the side zipper so your legs don’t come in contact with it (because it’s cold). They also prevent cold air from leaking into the bag through the needle holes that are created when sewing the zipper to the bag. Most bags have at least one zipper draft tube, although some have two, both top and bottom, that fall into place when you zip up your bag.

Snag Free Zipper

Snag-free zippers prevent the side zipper’s teeth from tearing the shell fabric of your bag and spilling its insulation. The zipper is usually bordered by stiff fabric tape, to keep it away from the down baffles and prevent it from getting snagged on the bag’s outer shell.

Nice-to-have features

Water-Resistant Down

Water-resistant down is a nice to have, not a must-have in an ultralight sleeping bag. The truth is most people can keep their sleeping bags dry. If you notice moisture on the outside of your sleeping bag in the morning, it doesn’t mean that the down inside is wet. Simply drape it over your tent in the sun while you eat breakfast and it will dry in no time.

Continuous baffles

Continuous baffles usually run horizontally across a bag. They allow you to shake the down in the baffles and move it to a different location. For example, if you’re too warm, you could shake the down so it fell down the sides of the bag, rather than keep it on your chest. While continuous baffles let you customize the distribution of down for different needs, many people prefer baffles that keep the down in one place reliably and permanently. It’s one less thing to worry about.

Partial length zippers

Partial-length zippers are often used as a weight-saving feature, however, they can reduce use across a wider temperature range by limiting your venting options.

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  1. If is made by Western Mountaineering I am all for it… I love their new bags but have no reason to give up my Ultralite which I bought in I think 1999 or 2000. And I also notice that their prices have only changed due to the greed of the Down providers.. My UltraLite has been on over 560 Backpacking trips and is my #1 go to bag second only to a Cats Meow which I bought in 2002 for a Trip where rain was expected for up to 5 days straight… Keep up the great reviews….

  2. +1 Western Mountaineering. My first and only bag is the Versalite 10F, bought in the late 1990’s for $375. Wanted something for the worst conditions in shoulder seasons in northern Rockies. Night temps range from high teens to mid-40’s. Older fabric is heavier than newer, but still ca. 2lb 2oz for 6’6″.

    Would like to reduce weight (and a 6′ is fine since I’m 5’10’), but as a restless side sleeper, I haven’t seen anything with comparable warmth/weight. Not sure I completely agree that quilts are as better based on the argument that the lack of loft underneath is useless. If the air mattress springs a leak I want all the insulation I can get, compressed or not.

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