Best Ultralight Sleeping Bag in 2021

This is a review of the best ultralight sleeping bag for your camping trips.

Looking for a lighter sleeping bag for your trip? This article is for you!

The ultralight sleeping bag makes your trip easier and more comfortable.

Lightweight does not have to compromise with comfort or warmth.

Besides the weight, always remember to check comfort, insulation, temperature ratings, weight-to-warmth.

Klymit KSB Down Sleeping Bag is the best one I recommend! Great value with a reasonable price. It’s comfortable and it can keep you stay warm in cold winter, even in the snow!

In this guide, you can find great ultralight sleeping bags that offer comfort and warmth!

Quick Summary

  • If you want a sleeping bag made for warm temperatures, then you consider the Hyke and Byke Ultra Lightweight Sleeping Bag. This sleeping bag is waterproof and comes with down insulation. It has a lower temperature limit of 30 degrees F, and 50 degrees F higher limit.
  • If you are looking for the best budget sleeping bag that comes with lightweight, comfortable, and warm, Winner Outfitters Mummy Sleeping Bag is the one that has the best value regarding its cost.
  • If you are looking for high quality with great performance sleeping bag, check the KLYMIT KSB Down Sleeping bag. It’s very light and you can trus it to stay warm even in a snowy day.
  • If you are looking for a premium sleeping bag that you can use for a longer time, then the Therm-a-Rest Questar Sleeping Bag is a good one to get! Plus, the loops at the back allow you to strap it to a camping mattress.

4 Best Ultralight Sleeping Bags

1. Hyke and Byke Ultra Lightweight Sleeping Bag


  • Weight: up to 2.89 lbs (varies by the size)
  • Waterproof: Yes
  • Comfort range: 30 – 50 Degrees F

2.8 lbs is lightweight and you can take it to hike further.

Regarding the seasons and weather that you can use it, it’s average for 3 seasons for the not really cold days.

The sleeping bag is made of insulation and waterproof fabrics, so there is a guarantee that it might keep you dry.

The nylon compression panels with straps that aid quick-release function. You can pack easily and it’s small to put with your backpack.

What we like:

  • It has enough space to guarantee maximum comfort for most body types.
  • It is tested for safety and reliability.
  • All sizes and models weigh less than 3lb.

What we don’t like:

  • The quality of the zipper is not very impressive.

2. Winner Outfitters Mummy Sleeping Bag


  • Weight: up to 2.8 lbs (varies by the size)
  • Waterproof: yes
  • Comfort range: 35 – 40 Degrees F

If you are a camping beginner or your budget is limited, Winner Outfitters mummy sleeping bag is the best one for you!

This sleeping bag is much cheaper than other bags in our picks, while it’s lightweight and comfortable in 3 seasons. 2.8lbs is light enough for you to hike.

Regarding this cost and the sleeping experience it can bring to you, this sleeping bag is super worthy.

Get this one if you are just into the camping or you have very limited budget!

What we like:

  • It has great value at its cost, lightweight, comfortable, and warm for 3 seasons.
  • Good quality with the material and zip.
  • It has enough room for you to sleep in.

What we don’t like:

  • The shell of it is 350T polyester with coating, it’s just average for waterproof.
  • It takes some work to put it back to the compression sack.

3. KLYMIT KSB Down Sleeping bag


  • Weight: up to 2.8 lbs (varies by the size)
  • Waterproof: Yes
  • Comfort range: 20 Degrees F

KLYMIT KSB Down Sleeping bag is a super trustful sleep bag. You can rely it for a warm and comfortable sleep in a cold day.

Regarding its quality and performance, the cost of it is average. So if you have a need for winter camping or you camping at regular times, get this high quality and durable sleeping bag will not be wrong!

Besides, the ¾ zip design that comes with two-way sliders allows you to move easily.

The inner part is made from silky soft nylon to give you maximum comfort.

What we like:

  • Great value at its cost, it’s light, durable, and warm.
  • It has some great features, such as a broad chest area, a stash pocket, and a convenient foot box.
  • It features a ¾ zip design with two-way sliders for better mobility.

What we don’t like:

  • The down fill power is low, which makes it a little bit difficult to compress.

4. Therm-a-Rest Questar Lightweight Down Mummy Sleeping Bag


  • Weight: up to 2.5 lbs (varies by the size)
  • Waterproof: Yes
  • Comfort range: 20 Degrees F

This sleeping bag is the most premium one in our list, but also pricy!

Great material with a SynergyLink connectors design with a down fills power of 650, it makes you feel very comfortable when you sleep in it.

The 20 degrees F temperature rating makes you stay warm in a cold weather.

With additional room for multiple positions fit, you can sleep with different positions in Therm-a-Rest sleeping bag. You will not feel tight or uncomfortable.

Besides, this sleeping bag comes with loops on the back that makes it possible to attach it to a camping mattress. The loops keep you stay on the mattress at the night. So no worries that you will slips away from the mattress.

What we like:

  • It has an impressive weight-to-warmth ratio.
  • Asides from the top zipper, it also has a bottom zipper in case you need more air circulation.
  • The loops at the back of the bag allow you to strap it to a camping mattress.

What we don’t like:

  • It’s a little bit pricy.

Best Ultralight Sleeping Bag: What to Consider?

Weight and Comfort

For an ultralight sleeping bag, a lighter one is a better choice. 3 lbs is a suitable weight. You can go further easier when you carry a less heavy backpack.

Comfort is an important feature you must consider. A comfortable sleeping bag makes you sleep well and recover from the tiredness of the daytime hike.

Temperature Rating and Warmth

Every sleeping bag has a temperature rating, and this gives you the right information about which one to go for under different weather conditions.

It matters!! As it will decide whether you can stay warm at the night.

Sleeping bags with a lower limit means you can withstand the cold up to that point.

If you camp in the cold winter, get the sleeping bag with lower temperature rating. If you hike for other 3 seasons, you can get most sleeping bags which rating from 30 degrees F.

Water Resistance

Most sleeping bags are water-resistance, while for the real performance, you will check to check the material of the shell.

Bags that have durable water repellent (DWR) coating comes with an extra layer that makes the sleeping bag hold water on the surface rather than soaking it. The DWR coating is usually on the shell fabric of the sleeping bag.

There is no guarantee here since they claim that sleeping bags are water-resistant may not be completely true during heavy rainfall.

While you can trust sleeping bags with this feature when you need to stay due to condensation in the tent.


Your ultralight sleeping bag could be one of the most expensive items in your backpack, a very good one is usually expensive because of the material it uses and special technology.

Thinking how often and how long you hope to use it, where you will need to use it, and find one that within your budget.

Useful Tips and Resources

If you are totally new for choosing the sleeping bags, you have to know there are majorly two categories of sleeping bags – mummy bags, and quilts.

Mummy bags cover you tightly with little space left. They can be quite cozy, but the tiny space means you might feel cramped. Generally, mummy bags are preferred in cold weather.

Quilts bags allow more space compared to mummy bags. So if you feel mummy bags will suffocate you, then this should be your choice.

However, unlike mummy bags, quilts don’t come with a hoodie, so you will have to get an alternative. Quilt is preferred when the temperature is above freezing. You can learn more from here.

Final Words

Getting the best ultralight sleeping bag is all about getting one that offers the best warmth, comfort, and for sure lightweight. It will last your multiple camping seasons.

Klymit KSB Down Sleeping Bag is the best one the you can trust for a sleeping bag.

Hope our guide helps, and get the right sleeping bag for your next camping trip!

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