Colin Snow
If you're looking to buy a sleeping bag from REI, there are a few things to consider. Firstly, understand the temperature ratings and choose a bag with a rating suitable for the lowest nighttime temperatures you expect when camping. Select a shape that gives you room to stretch; the four main shapes are rectangular, semirectangular, mummy, and double. Consider the insulation material; synthetic is more affordable and dries faster, while down is lightweight, durable, and compresses small. Finally, look for additional features such as a waterproof shell, snug-fitting hood, extra zippers, or a stash pocket to add durability, warmth, and functionality to your sleeping bag. REI offers a wide range of sleeping bags, including options for backpacking and car camping, with various temperature ratings, shapes, and features to suit your needs.
| Characteristics | Values |
|---|---|
| Temperature rating | Opt for a temperature rating below the lowest nighttime temperature expected when camping |
| Shape | Rectangular, semirectangular, mummy, or double |
| Material | Synthetic is more affordable, dries faster, and provides warmth when damp; down is lightweight, durable, and compresses small |
| Additional features | Waterproof shell, snug-fitting hood, extra zippers, stash pocket |
| Product recommendations | REI Co-op, Mountain Hardwear, Big Agnes, Therm-a-Rest, NEMO |
| Alternative | Camping quilts |
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What You'll Learn
Sleeping bag temperature ratings
The temperature rating of a sleeping bag identifies the lowest temperature at which the bag is designed to keep an "average sleeper" warm. It is important to select a bag with a temperature rating lower than the lowest temperature you expect to encounter. This is because you can always unzip a bag that feels too warm, but you don't want to be left with a bag that doesn't provide enough warmth. Sleeping bags with lower temperature ratings often include features such as snug-fitting hoods to provide more warmth.
There are two main temperature ratings within the standardized laboratory test range: the comfort rating and the lower limit rating. The comfort rating indicates the temperature at which a cold sleeper might feel comfortable, and this is typically used for women's bags. The lower limit rating, which is always lower than the comfort rating, indicates the temperature at which a warm sleeper might still feel comfortable, and this is usually used for men's bags. The comfort rating is used for women's bags because data shows that the "average woman" will feel colder in the same bag as the "average man."
When choosing a sleeping bag, it is also important to consider the shape of the bag, as this can affect its warmth and weight. Mummy-shaped bags have a snug fit to boost warmth and reduce weight, while semi-rectangular or barrel-shaped bags offer a compromise between warmth and roominess. Rectangular bags provide plenty of room to move around but may not retain heat as well as the other shapes. Backpacking bags tend to be more lightweight and snug, while camping bags offer more room to move around.
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Sleeping bag shapes
Sleeping bags come in a variety of shapes, each with its own advantages and disadvantages. The three most common shapes are rectangular, semi-rectangular (or "modified mummy"), and mummy.
Rectangular sleeping bags offer ample room for legs and arms to stretch out and are ideal for campers who prioritise comfort over warmth. Some rectangular bags can be completely unzipped and used like a comforter, making them a good choice for warm-weather camping. They tend to be bulkier and heavier than other shapes, making them more suitable for car camping than backpacking.
Semi-rectangular sleeping bags, also known as "modified mummy" or barrel bags, offer a compromise between warmth and roominess. They are generally more slender than rectangular bags, with a rounded top and a slight taper at the bottom. This shape is well-suited for cool-weather camping when conditions are chilly but not frigid.
Mummy sleeping bags are designed to boost warmth and reduce weight. They have a slim cut and a snug fit, typically allowing you to roll over with the bag rather than inside it. The contoured hood can be cinched tight for greater warmth. The fitted shape provides maximum heat retention, making them ideal for bitterly cold conditions. Mummy bags are typically lighter than other shapes, making them a popular choice for backpackers.
In addition to these three basic shapes, there are also double sleeping bags designed for couples and kid-sized bags, which are simply shorter and smaller variations of adult sleeping bags.
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Sleeping bag materials
The materials used in a sleeping bag can significantly impact its performance, insulation efficiency, durability, and comfort. Sleeping bags are typically made of synthetic materials or natural materials like cotton, canvas, silk, or down.
Synthetic materials are often used for their lightweight properties and ability to retain heat even when wet. Synthetic insulations are usually secured via quilting, shingling, or layering to minimize the shifting of the insulation material and prevent cold spots. Synthetic bags are popular for backpacking due to their ease of packing and transportation.
Natural materials like cotton and flannel are known for their softness and warmth, making them ideal for colder temperatures. Cotton flannel sleeping bags provide a cozy and comfortable sleeping experience. However, natural materials can be heavier, which may not be suitable for backpacking.
Canvas sleeping bags, made from cotton or synthetic canvas, offer durability and insulation. Canvas is a breathable material that allows air circulation, preventing condensation and keeping the sleeper dry and comfortable. It is also a heavier-weight material, providing excellent warmth, making it suitable for cold weather conditions.
Down sleeping bags use the fluffy plumes from geese and ducks as insulation. The quality of down is determined by the number of plumes and the absence of quills, resulting in higher fill powers. Higher fill power means less down is needed to achieve the required loft for a given comfort range or temperature rating.
The outer shell of a sleeping bag is typically made of durable materials like ripstop nylon or polyester, sometimes treated with a DWR (Durable Water Repellent) finish. The shell protects the bag from moisture and prevents the migration of insulating materials. The lining, on the other hand, facilitates the transfer of moisture away from the body, enhancing comfort. Dark-colored lining materials also help dry the bag in the sun by absorbing more heat.
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Sleeping bag features
Sleeping bags come in a variety of shapes, including rectangular, semirectangular, mummy, and double. The shape you choose will depend on your personal preference and the amount of room you want to be able to stretch out. Rectangular bags offer the most room, while mummy bags are more form-fitting and may not be as comfortable for those who like to move around while they sleep.
Temperature rating is another important feature to consider when choosing a sleeping bag. Opt for a bag with a temperature rating that is lower than the lowest nighttime temperature you expect to encounter while camping. This will ensure that you stay warm and comfortable throughout the night.
The filling of a sleeping bag also affects its warmth, weight, and price. Synthetic filling is typically more affordable, dries faster, and still provides warmth when damp. Down filling, on the other hand, is lightweight, durable, and compresses to a smaller size, making it easier to carry.
Other features to look for when purchasing a sleeping bag include a waterproof shell, a snug-fitting hood, extra zippers, and stash pockets. These features can add durability, warmth, and functionality to your sleeping bag, enhancing your camping experience.
In addition to sleeping bags, you may also want to consider a camping quilt, which can provide more flexibility and breathability. Sleeping pads are another essential component of your sleep system, adding insulation and comfort. Look for a pad that balances weight, durability, comfort, and warmth, such as the Therm-a-Rest NeoAir XLite NXT, which is highly regarded for its rare combination of these features.
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Sleeping bag sales
If you're looking for a sleeping bag, now is a great time to buy as our biggest sale of the year is on! Our Anniversary Sale is offering savings through 5/26, with no shortage of sleeping bag options.
Our experts recommend these nine sleeping bags for backpacking, including top picks from REI Co-op, Mountain Hardwear, Big Agnes, Therm-a-Rest, and NEMO. When choosing a sleeping bag, it's important to consider the temperature rating, shape, and features.
Opt for a sleeping bag with a temperature rating below the lowest nighttime temperature you expect when camping. There are four main shapes to choose from: rectangular, semirectangular, mummy, and double. Generally, you'll want one that gives you room to stretch. Synthetic bags are more affordable, dry faster, and provide warmth when damp, whereas down bags are lightweight, durable, and compress into a small size.
Consider other features such as a waterproof shell, a snug-fitting hood, extra zippers, or a stash pocket, which can add durability, warmth, and function to your sleeping bag. If you're unsure about whether to get a sleeping bag or a camping quilt, we've broken down the differences to help you choose the best option for your next adventure.
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Frequently asked questions
REI has a wide range of sleeping bags available, including options for backpacking and car camping, with a variety of temperature ratings and shapes. Some of the top picks include sleeping bags from REI Co-op, Mountain Hardwear, Big Agnes, Therm-a-Rest, and NEMO.
When buying a sleeping bag from REI, consider the temperature rating, shape, and additional features. Opt for a sleeping bag with a temperature rating suitable for the lowest expected nighttime temperatures. Choose from one of the four main shapes: rectangular, semirectangular, mummy, or double. Consider additional features such as a waterproof shell, snug-fitting hood, extra zippers, or a stash pocket.
Yes, REI often has sales and promotions on sleeping bags. Keep an eye out for their Anniversary Sale, which offers significant discounts on a wide range of outdoor gear, including sleeping bags. You can also earn rewards by using the REI Co-op Mastercard.
