8 Best Ultralight warm weather sleeping bag in 2023

After a hard day on the trail, your body needs a good night’s sleep to recover. Therefore, getting the right one that suits your sleep position is crucial for sleeping bags. It is also true that nowadays when it comes to sleeping bags, you will find many options available. But don’t worry; this blog lists some of the best sleeping bags on the market, based on hundreds of nights spent testing different loads in different conditions. Finding the best lightweight sleeping bag is essential for walking long distances on foot or backpacking. In addition to being lightweight, the best backpacking sleeping bag also has to be compact, which makes it easier to pack; a double bonus if you’re going on an adventure that requires limited pack space.

List of top ultralight warm weather sleeping bags

01. Therm-a-Rest Hyperion 32F/0C Ultralight Down Mummy Sleeping Bag
  • It is extremely lightweight.
  • It is no better hydrophobic
    down than this one.
  • The bag can be compressed
    and packed very easily.
  • The baffled box
    construction provides
    thermal efficiency.
  • A sleeping pad hugging
    strap is integrated into
    this sleeping bag.
  • It is pricey.

Therm-a-Rest Hyperion- Sleeping bags made by Therm-a-Rest are known for their quality. This bag is extremely lightweight and packable, like those made by other top-end manufacturers. Users should note that the bag is marketed as a 32F bag.

Therm-a-Rest Hyperion  Ultralight sleeping bag with comfortabely sleeping
Therm-a-Rest Hyperion Ultralight sleeping bag
Therm-a-Rest Hyperion Ultralight sleeping bag with bag packing

Key features

  • To ensure a sturdy bag, it is constructed with box baffles.
  • This bag weighs 8.5 ounces.
  • A 70 percent insulation layer on top of the bag provides maximum warmth and weight savings.
  • This bag has a cinchable hood with a draft collar.
  • Two-way zippers are snag-resistant.
  • Two removable straps for sleeping pads are also ingeniously integrated.
Therm-a-Rest Hyperion 32F/0C Ultralight
Down Mummy Sleeping Bag
02. Sierra Designs Nitro 35 Degree 800 Fill DriDown Sleeping Bag 
  • The down fill power is 800,
    so it is highly hydrophobic .
  • A draft collar seals in the
  • To prevent down shifting,
    sidewall baffles are also
  • The foot vent is self-
    sealing and innovative.
  • The zipper is anti-snag.
  • The compression straps are
    missing from the stuff sack.

Sierra Designs Nitro 35 Degree 800 Fill DriDown Sleeping Bag-It is another popular product from Amazon. Unlike old synthetic bags, it compresses to 1/3rd its size and weighs about five pounds less due to its design and use of high-quality 800 power fill down. The bag reduces weight and improves thermal efficiency using a baffle design and mummy cut.

Sierra Designs Nitro 35 Degree 800 Fill DriDown Sleeping Bag for both men and women
Sierra Designs Nitro 35 Degree 800 Fill DriDown Sleeping Bag with bag packing
Sierra Designs Nitro 35 Degree 800 Fill DriDown Sleeping Bag

Key features

  • The designers reduced the weight by using a ½-length zipper.
  • A material that resists snags is included.
  • The bag weighs 1.5 pounds.
  • It measures 13 by 7 inches and is made of non-compressible material.
Sierra Designs Nitro 35 Degree 800 Fill
DriDown Sleeping Bag 
03. Mountain Hardwear Bishop Pass Sleeping Bag
  • The bag is extremely
  • The fill power of the down
    is very high.
  • It packs exceptionally
    well and is highly
  • The zipper is snag-proof.
  • This bag is prone to tear.

Mountain Hardwear Bishop Pass Sleeping Bag- Ultralight and exceptionally packable, this sleeping bag utilizes narrow construction and advanced materials to keep weight to a minimum. With 10 ounces of down fill, the bag is warm and comfortable.

Mountain Hardwear Bishop Pass Sleeping Bag
Mountain Hardwear Bishop Pass Sleeping Bag to carry
Mountain Hardwear Bishop Pass Sleeping Bag warm inside

Key features

  • A 20D ripstop nylon fabric is used in the manufacture of this product.
  • A 650-fill down insulation is offered.
  • There is a full-length zipper on this bag.
  • Bags are tuck-stitched throughout.
Mountain Hardwear Bishop Pass
Sleeping Bag
04. Sea to Summit Spark 28-Degree Ultralight Down Sleeping Bag
  • It offers excellent
    warmth-to-weight ratios.
  • It is incredibly light.
  • The baffle design is double
    zoned full box.
  • It’s ridiculously small when
  • The torso has vertical baffles
    that make sleeping on
    your side more comfortable.
  • The zipper is only half-length,
    so it is less versatile.

Sea to Summit Spark 28-Degree Ultralight Down Sleeping Bag-There are different sizes and colors available in the Spark series, including 28F, 40F, 5F, and 18F options. Material quality is excellent on this bag. The Spark series has two kinds of nylons: ripstop 10D nylon and a soft 5D nylon that feels great against the skin.

Sea to Summit Spark  with side guiding
Sea to Summit Spark  sleeping bags with lifetime gurantee
Sea to Summit Spark  comfortable sleeping bags

Key features

  • The body of this sleeping bag is baffled vertically, while the legs and feet are baffled horizontally.
  • Thanks to the ergonomic foot box, you can also move your feet freely at night.
  • It features a zipper guard made of nylon that prevents snagging.
  • The hood can be adjusted, and the draft collar can be adjusted.
  • This product comes with a lifetime warranty.
Sea to Summit Spark 28-Degree
Ultralight Down Sleeping Bag
05. MARMOT Ultra Elite 20 Sleeping Bag
  • ElixR microfibers are
    resistant to wet conditions.
  • Lightweight and compact.
  • The foot box has anatomical
    shapes that provide warmth
    for the lower extremities.
  • The draft tube is insulated
    to ensure total insulation.
  • There is no abrasion-proof
    coating on the compression

-This synthetic sleeping bag provides down-like warmth with moisture resistance and is made with an intuitive blend of synthetic fibers. There is a chord-adjustable hood and snug on this sleeping bag, as well as a foot box that wraps around your feet to increase insulation.

MARMOT Sleeping-Bags  with elixer mixo
MARMOT Sleeping-Bags  with many sizes
MARMOT Sleeping-Bags  with comfortable sleeping

Key features

  • There is only a two-pound weight to it.
  • The mummy shape makes it compact.
  • Temperature-sensitive belongings can be stored.
  • If the bag becomes too hot, the camper can open the vents using the two-way zipper.


MARMOT Ultra Elite 20 Sleeping Bag
06. Western Mountaineering MegaLite Sleeping Bag
  • The material is light and
  • The foot compartment
    is ergonomically
  • The material is durable.
  • Excellent water-resistant
  • Breathability is lacking on
    the inside.

For anyone looking for a sleeping bag that offers more comfort than traditional narrow ultralight bags, the Western Mountaineering MegaLite is an excellent choice. A wide shoulder, hip, and foot area ensure that sleepers can move freely in their bag no matter their length.

Western Mountaineering MegaLite  sleeping bags
Western Mountaineering MegaLite  with many colours
Western Mountaineering MegaLite  with bag to carry system

Key features

  • The bag weighs about 1.5 pounds.
  • A high-tech nylon outer shell makes it water resistant and durable.
  • The temperature rating is 30F for the bag.
  • The outer shell is made of nylon, which is water-resistant.
Western Mountaineering MegaLite
Sleeping Bag
07. The North Face Eco Trail Sleeping Bag
  • Recycled polyester material
    makes it a great choice.
  • Side zippers are included.
  • The price is reasonable.
  • Durable bag.
  • Compressibility is poor, and
    it is heavy.


There is enough room in this sleeping bag for two people to sleep comfortably. A sleeping bag is ethical; it contains recycled polyester for all its materials, from the insulation to the shells.

The North Face Eco Trail Bed Double 20 F for camping
The North Face Eco Trail Bed Double 20 f
The North Face Eco Trail Bed Double

Key features

  • A 100% recycled 600-fill down fills this down comforter.
  • You can sit comfortably with a 14″ side zipper at the collar.
  • The materials used in the construction of this bag are 100% recycled.
  • This bag has a wraparound zipper around the foot box so it can lie flat.


The North Face Eco Trail Sleeping Bag
08. Kelty Cosmic 20 Degree Down Sleeping Bag
  • A water-repellent and soft lining
    is included in the sleeping bag.
  • The foot box has an
    anatomical design and
    is spacious.
  • The fabric provides a
    water-repellent treatment
    and a smooth texture.
  • There are two anti-snag,
    sliding zippers, and a
    comfortable foot-box.
  • Well-insulated and durable.
  • It is sometimes difficult to
    move freely due to its shape.
  • It has a bulky appearance.

Kelty’s Cosmic 20 sleeping bag is renowned for its affordability and performance. Featuring trapezoidal down pockets that maximize baffling and ensure consistent insulation, this bag is known for its unique design.

Kelty Cosmic 20 Degree Down Sleeping Bag with pockets
Kelty Cosmic 20 Degree Down Sleeping Bag
Kelty Cosmic 20 Degree Down Sleeping Bag with ultra bag packing

Key features

  • It is perfect for camping during all seasons.
  • The down insulation is water-resistant.
  • A 600-fill drawdown insulating material is used in this sleeping bag.
  • Heat is retained efficiently, and it is compressible.
  • Each plume of down is coated with a hydrophobic finish.


Kelty Cosmic 20 Degree Down
Sleeping Bag

Things to consider while purchasing warm weather sleeping bag

A faster, lighter approach to backpacking typically results in less body fatigue and less strain on the body. It’s important to know exactly what you need before buying ultra-lightweight sleeping bags since they tend to be expensive—getting a sleeping bag that weighs half as much as regular backpacking will require you to sacrifice some aspects of comfort, warmth, or versatility—the lightest and fluffies, fluffiest, and high-quality ultra-lightweight bags lighter. You should keep a few things in mind when shopping for a summer sleeping bag.

01. The temperature rating

A rating is usually given to every sleeping bag by the manufacturer. The sleeping bag will remain comfortable in the coldest temperatures depending on the rating. It would help to look for sleep bags rated between 20 and 50 degrees for summer. In areas with variable weather or where the days are warm but the nights are cool, a sleeping bag rated at 30 degrees might be more appropriate. If you’re staying in a hot, humid climate, you should buy a sleeping bag with a rating of 40 to 50

02. Safety

Besides comfort items, sleeping bags play an essential role in hikers’ lives. Backcountry survival systems rely heavily on these items. Before using ultra-lightweight gear, please ensure you understand how it works. Avoid situations where you might become hypothermic because you desire to shave ounces. Leave yourself a little margin for weather changes and take the right gear.

03. Down insulation

The best warmth-to-weight ratio of any synthetic fiber comes from goose down, which is used in almost every sleeping bag. High numbers indicate loftier down, and the higher numbers indicate better down. So, ensure that your down bag stays dry! Hydrophobic DWR finished down has recently been introduced to combat this problem. Therefore, make your choice accordingly.

04. Packaging

This number measures a sleeping bag’s compressibility. By making it smaller, you can use a lighter backpack and take up less space in your pack. Get a waterproof stuff sack with compression straps if your sleeping bag’s stuff sack doesn’t have them. Compression sacks are handy for reducing bag size by half.

05. Cut

Form-fitting mummy bags are the most common shape for ultra-lightweight sleeping bags. This sleeping bag with a narrow foot, hips, and shoulders saves weight by being smaller. The hoods of these garments typically feature a collar or neck baffle, which can be cinched tightly around the mouth and nose to retain maximum warmth. Check before you decide if your UL bag has a hood. Since mummy bags have a form-fitting design, they are also more claustrophobic than traditional sleeping bags, but they help to keep you warm since they do not contain as much air as conventional sleeping bags. So choose wisely

Frequently Asked Questions: FAQs

Are sleeping bags necessary in warmer weather?
Warmer weather doesn’t require a sleeping bag, technically. However, it is all about what’s comfortable for you. Some people feel more comfortable with a lightweight sleeping bag even in very warm weather, So it is a personal choice.
When it comes to warm-weather sleeping bags, what type is best?
It is best to buy a sleeping bag with a temperature rating of 30 degrees or higher for warm weather. Sleeping bags that unzip all the way around are ideal for people who sleep warm as they can be used as blankets or pulled down if they get too hot.
   Does a sleeping bag weighing four pounds seem heavy?
Yes, it is. A sleeping bag that weighs four pounds is quite heavy. Weight might not matter much if you’re hiking for short distances, but for longer distances, it does matter. Packing a sleeping bag weighing four or more is generally more comfortable and roomier. Ideally, you should invest in the lightest sleeping backpack you can afford if you plan on hiking long distances over several days.
Do goose down sleeping bags work well with UL?
Yes, of course. It is recommended that UL bags be filled with goose down insulation. If you want the most loft and the least weight, look for down with a power fill rating of 800 or higher. Furthermore, it is one of the most expensive downs available.
Which sleeping bag is the coolest?
Sea to Summit Ultralight Down Sleeping Bag liner is one of the coolest sleeping bags. It’s lightweight, breathable, and wicks sweat away during the warm hottest nights.
Do Sleeping Bags Hold More Heat if Fewer Clothes Are On?
You can add extra warmth to your sleeping system by wearing clothes in your sleeping bag. If you overheat during the night, you can cool down by taking layers off inside your sleeping bag. It is common for people to sweat more in the early hours of the morning without any pajamas or base layers on. Sleeping typically requires me to wear merino base layers underneath a fleece top.
Do using 20-degree sleeping bags too hot in the summer?
For summer use, a sleeping bag with a temperature of 20 degrees Fahrenheit will be too hot. It can be used as a quilt with a full-length zip, but a lighter summer bag would be better. Camping during warm nights with a temperature rating of at least 40 degrees Fahrenheit is ideal.
Are zero-degree sleeping bags suitable for summer use?
Zero-degree Summer sleeping bags are not very comfortable for summer,but you can use them if you want.Using a zero-degree sleeping bag in the summer might make you sweat and feel uncomfortable.Choose a sleeping bag rated for temperatures up to 30°C instead.
My sleeping bag has a hole; what should I do?
You should carry stick-on patches on fast-packing trips to repair holes in sleeping bags. Type A Tear Aid should be sufficient for one sheet. The sleeping bag may last long, but it may not withstand more than one wash cycle. You may be able to get a more permanent patch if the tear is large. Contact the manufacturer if this is the case.


It has been a while since sleeping bags appeared on the market, and plenty of options are available today. With well-designed systems and proper planning, ultralight sleeping bags can be used during all seasons. A mountain sleeper bag like this is ideal for people who wish to travel quickly without carrying a bulky purse. I hope you find the right ultralight sleeping bag or quilt for your adventure in the backcountry with our thorough comparison of the top models. Our team has tested ultra-light quilts and sleeping bags from mountain to desert to forest conditions to give you the best advice possible.

Also read,

Best sleeping pads for cold weather

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