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10 Best Ultralight Sleeping Bags of 2024

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 have no pad attachment straps to mess around with in the dark. Many ultralight sleeping bags are also available without mummy hoods. They can be easily vented, providing all of the comfort advantages of backpacking quilts for people who prefer hoodless sleep insulation.

Make / ModelTypeWeight
Western Mountaineering Summerlite 32Mummy19 oz / 539g
Therm-a-Rest Hyperion 20Mummy20 oz / 567g
Western Mountaineering Flylite 34Mummy14.25 oz / 404g
Mountain Hardwear Phantom 30Mummy22.1 oz / 626g
Zpacks Mummy Sleeping Bag 20Mummy22 oz / 625g
Western Mountainering Highlite Mummy16 oz / 454g
Feathered Friends Flicker 40Hoodless18.5 oz / 525g
Enlightened Equipment Convert 40Hoodless22.8 oz / 646g
Therm-a-Rest Ohm 20Hoodless22 oz / 624g
Feathered Friends Tanager 20Hoodless18.6 oz / 527g

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

1. 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 to 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 in the chest and is best used by people with a smaller stature.

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2. 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.

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3. Western Mountaineering Flylite 34

WM Flylite Sleeping Bag
Designed thru-hikers, trail runners, and bike packers, the Western Mountaineering Flylite 34F 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.
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4. Mountain Hardware Phantom 30

Mountain Hardwear Phantom 30 Sleeping Bag
The Mountain Hardwear Phantom 30 (updated in 2024) is a premium 800-fill power sleeping bag with a two-way full-length zipper, a down draft collar, a lightweight 10D nylon shell, and a black 15D liner for faster drying in the sun. The bag’s four-chamber hood design maintains an even loft around the head for consistent warmth while the contoured footbox follows natural foot position. It has a non-#5 YKK zipper and taped construction around the zipper to reduce snagging and ensure reliable use for all of your backpacking and camping adventures. 
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5. 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.

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6. Western Mountaineering Highlite 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 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.

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7. Feathered Friends Flicker 40

Feathered Friends Flicker UL Quilt Sleeping Bag
The Feathered Friends Flicker 40 UL Quilt Sleeping Bag is a 18.5-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.

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8. 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 22.8 oz. Read the SectionHiker Convert Review.

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9. 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, a draft tube, a puffy draft collar, and a silky 10d nylon/ripstop shell. The Ohm can be unzipped in warmer weather and used as a blanket or quilt. Read the SectionHiker Ohm 20 Review.

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10. 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.

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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 hoodless rectangular bags, similar to quilts. Which you choose is a personal preference, but a mummy hood can be a bonus in colder temperatures when more head insulation is warranted. When sleeping in a hoodless sleeping bag, you’ll want to use some head covering, like a fleece or down cap, or sleep in a puffy down jacket with a hood to keep your 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.

  3. No Cumulus Bags……

    • I’d also recommend cumulus but maybe they are expensive for North Americans to obtain from Poland. Most US manufacturers are too expensive for me to import from the states. I’d only go for th my if they have a retailer in the EU or if there wasnt an EU equivalent..

    • x lite 200 at 350 g and packed size c.a. 2 L without significant loft detoriation is a game changer

  4. Based on your review a while back, I bought a FF Flicker 40. It is astounding how versatile that quilt/bag is. And it feels luxurious for a 40 degree rating. I and a friend to whom I loaned it have taken it well into the 30s and been perfectly warm.

  5. I’ve got a 30 degree GoLite bag with full zip that weighs 24 oz. and becomes my quilt when hammock camping. It doesn’t have all the features but it works well for me. As a warm sleeper, I’ve taken it down to a couple degrees below zero F and been comfy. Of course, for those backyard excursions, I’ve also had on long johns and extra layers.

  6. Maybe somebody would explain to me the high regard for Western Mountaineering sleeping bags & quilts? I use a PHD sleeping bag, though I’m not so sold on it & really like the idea to try a quilt. I keep looking at other brands & regularly read what seem like rave reviews of Western Mountaineering kit. They look OK, but specs seem quite underwhelming though & never having seen one for real, I’m definitely not convinced enough to spend money on their products. Any thoughts?

    • Other manufacturers have caught up with them. That is true. They’re still very high quality bags, with down fill power that often exceeds what’s documented in the specs. I also think they’re zipper treatments are still second to none. if I were going to buy a new bag though, I’d probably go to Feathered Friends first.

  7. What is your opinion on the REI Magma 15? I picked up a barely used one, last years model I believe, for $35 at REI used gear.

  8. I bought two custom made Western Mountaineering sleeping bags in 1973. They are beautiful and still going strong. I vote for Western Mountaineering and Feathered Friends for the best sleeping bags. I vote for Katabatic Gear for the best quilts.

  9. My wife and I each have 3 different Western Mountaineering bags (for different temps). We love them, especially the ultra dependable zippers. Very well made, plus made in the USA.

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