Choosing the Best Sleeping Bag for Cold Weather Camping and Backpacking

Why Sleeping Bags are important 

Sleeping bags are basically lightweight beddings designed in a tube form usually with a zipper to provide warmth for a user staying outdoors. It is popular among outdoor campers and people in other outdoor activities like hiking and mountain climbing.

Physical conditions like the weather are part of the major determinants of health so sleeping bags do more than keep one comfy, they actually preserve one’s health.

They can save a user from the dangers of frostbite and hypothermia associated with very cold weather. Hypothermia is an abnormally low body temperature caused by prolonged exposure to cold.

In principle, sleeping bags work pretty much the same as quilt beddings; they provide warmth and thermal insulation through multi-layered textile. The designs for sleeping bags vary depending on a wide range of factors including the anticipated temperature, size, and shape.

The Anatomy of a Sleeping Bag

There are just a few major functional parts of a regular sleeping bag which include the shell, the insulation materials, and the zipper.

The shell of the outer and internal surface fabric houses the inner isolation material and protects the user from external conditions. They can be breathable or waterproof or durable water repellent (DWR) coated shells.

Kelty Cosmic 20 Degree 550 Down Fill Sleeping Bag for 3 Season Camping

Other parts include the baffles, which are the compartments within the bag that controls the heat transfer; the hood for covering the head; and the foot box which especially keeps the feet warm. Some manufacturers provide stuff sacks and storage sacks for packing.

How to Choose the Best Cold Weather Sleeping Bag

When choosing the best sleeping bag that it’s suitable for you, there are a few things you have to consider. Some are fundamental like the temperature ratings while others like shape and color are a matter of personal preference.

Insulation

Probably the most debated aspect of sleeping bags is the type of insulation that is, between the synthetic or down insulation. While down insulations, made from duck or goose feathers, are known to provide superior thermal insulation than synthetic, both have their pros and cons.

Down insulations have a superior warmth-to-weight ratio which means light bags can provide sufficient warmth whereas synthetic insulations, usually made from polyester fibers, perform better in wet conditions.

They are designed to maintain a decent warmth-to-weight ratio and also be water-resistant making them ideal for humid conditions.

Hyke & Byke Katahdin Hiking & Backpacking Sleeping Bag - 4 Season

Another factor here is the ‘effectiveness’ of the insulation measured by how many cubic inches one ounce of down can fill. This is known as the fill power.

Down insulation can have fill power ranging from 450 to 900; at the latter end of this spectrum, one can get more warmth from lighter insulation material. 

Temperature Rating

Sleeping bags are often categorized by temperature conditions where they can be used. It is important to choose a sleeping bag with a suitable rating for your environment one that does not make you too warm or leave you too cold.

This rating is similar to the rating for outdoor camping tents. It ranges from one-season sleeping bags to five-season sleeping bags where one-seasons are suitable for warmer climes and five-season sleeping bags are for the coldest and humid conditions.

One-season sleeping bags are suitable for typical night temperatures of 10 degrees Celsius or more. They are often used in warm summer seasons or late spring when one can anticipate the coldest temperatures of about +4 to +5 degrees. They often come without a hood and can be completely unzipped.

TETON Sports LEEF Ultralight Mummy Sleeping Bag Perfect for Backpacking, Hiking, and Camping

Two-season sleeping bags are ideal for late spring, summer, and early autumn periods usually with night-time temperatures 5 degrees Celsius or higher.

These are a bit more versatile than the one-season sleeping bags but are not ideal for temperatures below 0 degrees Celsius.

Three-season sleeping bags are best suited for spring and autumn seasons when nights can get very cold but not freezing. A night-time temperature of 0 degrees is normal.

However, three-season sleeping bags are the most common and versatile bags available as they can be used all year round, although one may have to leave them unzipped on warmer nights. 

Four-season sleeping bags are designed for the very cold conditions of winter and some really cold winter nights. As expected, this category of sleeping bag will get the user sweaty outside the winter season.

Five-season sleeping bags are like the SUVs of sleeping bags, designed to protect the user from adverse weather conditions on freezing cold and snowy nights. They are markedly more durable than other bags and are made with water-repellent fabrics.

You may find that some sleeping bags are not rated in the traditional ‘seasons’ ratings but by using a single temperature standard for normal sleepers.

This rating established under the European EN13537 standard rates sleeping bags based on comfort rating, extreme rating, uppers, and sometimes lower limits of comfort.

Sierra Designs Cloud 20 Degree DriDown Sleeping Bag for Backpacking and Camping

The Comfort Rating is based on the lower limit of a 'standard' adult woman having a comfortable night's sleep.

The Lower Limit is the lowest temperature at which a standard man can have a comfortable night's sleep.

The Upper Limit is the highest temperature at which a 'standard' adult man is able to have a comfortable night's sleep.

Extreme rating is the minimum temperature at which a standard man can survive without risk of death from extreme cold. As an extreme survival rating, it is not recommended for general use sleeping bags. The best general guideline is usually between a comfort rating and a lower limit. 

Size

The length and widths of sleeping bags should be considered when making one’s choice. It is important you have just enough space to move around and not too much to affect the warmth of your bag.

Shape

Just like the size, the shape of a sleeping bag is important to ensure you are comfortable in it. The two common designs are the mummy style and the quilt style.

Like it is called, the mummy-style allows users to tuck one’s head in like a mummy and provides more insulation around one’s head whereas the quilt style looks like a down comforter with a zipper.

There is also a women’s sleeping bag which has a different shape. These are slightly narrower around the shoulder and wider in the hips. They also have more insulation than men’s sleeping bags since women normally generate less warmth compared to men.

Big Agnes Anvil Horn Sleeping Bag

Weight

The weight of a sleeping bag is important for packing and for hikers who have to carry them along on their journey. While a heavier bag tends to provide more warmth, a lightweight bag of less than 1 pound which provides adequate insulation is preferable.

1. Outdoor Vitals Summit 0°F Premium Down Sleeping Bag

• Size: varied
• Weight: 2 lb 12 oz
• Temperature Rating: 10 degree
• Shape: mummy style
• Fill: 800
• Insulation: duck down

This sleeping bag from Outdoor Vitals is suitable for the harshest conditions of winter with an extreme rating of 0 degrees and a comfort rating of 10 degrees.

It has duck-down insulation with a fill power of 800 which makes it lightweight and durable. Not only is it lightweight, but the bag is also super-compressible and as such easy to pack for your hiking and outdoor activities.

When compressed, the bag can take up as little space 11 x 8 inches and it also comes with a 4-point compression bag.

The outer shell fabric is coated with a water-resistant part of the VitalDry DWR technology for warmer and drier outcomes.

If you’re up for a durable, lightweight sleeping bag that can withstand freezing cold and moist conditions, this might just be the ideal stuff for you. It’s affordable too; at less than $200 you get a budget sleeping bag with high fill power.

2. Cotopaxi Sueno Sleeping Bag

• Size: unspecified
• Weight: 2lb 13oz
• Temperature Rating: 15 degree
• Shape: mummy style
• Fill: 800
• Insulation: duck down

Cotopaxi Sueno Sleeping Bag is lightweight with a temperature rating of 15 degrees, versatile enough to be used through fall, spring, summer, and mild winter.

It comes in a classic mummy shape and ample foot space. It is made of water-resistant duck down with a fill power of 800.

If you’re looking for a sleeping bag that is wide enough to turn over at night, light enough to carry easily, and can keep you warm and comfortable in most seasons, this is the sleeping bag for you. 

3. Hyke & Byke Antero Hammock Compatible Down Sleeping Bag

• Size: varied
• Weight: unspecified
• Temperature Rating: 15 degree
• Shape: mummy style
• Fill: 800
• Insulation: goose down

This sleeping bag is a durable, lightweight, and affordable four-season rated bag. It has an extreme limit of 15 degrees F and a lower limit of 30 degrees F which makes it suitable for very cold outdoor conditions.

Its insulation is made with goose down with a fill power of 800 and the shell is made of waterproof fabric treated with water repellent.

This is another great budget sleeping bag well under $200 and it integrates so well with your hammock.

• What does the temperature rating mean on a sleeping bag?

The temperature rating specified on sleeping bags usually refers to the comfort temperature rating which is the lowest temperature at which a standard man can sleep comfortably for a night in the bag.

• How do you stay warm in a sleeping bag?

A regular sleeping bag uses multiple layers of special cloth to keep the user warm. Also, special insulation made from duck feathers, goose feathers, or synthetic fiber is locked in between the cloths to prevent you from losing body heat to the cold environment.

• What is the best winter sleeping bag?

 The best sleeping bag will be one that provides sufficient warmth and is still lightweight. For winter, the sleeping bag would be a four-season or five-season sleeping bag with a comfort temperature rating of 10 degrees. Preferably, it should have duck-down insulation with a fill of at least 800 and a water-repellent shell material.

Choosing a can be a compromise between factors like weight and insulation but somewhere in between, you will get the right sleeping bag specifications that meet your needs.

Also, persons who camp around the year may have different sleeping; bags for the harsh winter conditions and for the warmer seasons.