Best 40 Degree Rectangular Sleeping Bags for 2019


Our review process

We have collected, researched, and analyzed information on hundreds of different kinds of sleeping bags in order to show you our top rated sleeping bags on the market. We then further sub-categorized them and looked more specifically at 19 different 40 degree rectangular sleeping bags. In our research, we took into consideration a large variety of different main features among the 28,000 different data entries and combined it with customer reviews to inform you of the finest 40 degree rectangular sleeping bags available on the market. But don't just take our word for it, check out the advantages and disadvantages of some of the main specs.

If you are planning a trip and looking for a new 40 degree rectangular sleeping bag, you're in the right place. 40 degree sleeping bags should keep you comfortable down to 40°F. They are more affordable than sub-zero degree bags, so you can get one without feeling worried about going outside of your budget. These sleeping bags open completely, allowing you to unzip them or to just use as a quilt on really warm nights. They are ideal for warm weather trips, so they help vent heat, keeping you cool if a hot front comes through.

Rectangular sleeping bags are roomy and spacious, allowing you to spread out with a generous amount of space. They accommodate varying sleeping positions, making them ideal for people who are particular about sleeping in certain positions such as their sides or stomach. With double zippers, they are perfect for sleeping two as you can attach two sleeping bags to each other. However, they are not very heat-efficient, creating more room inside which can weaken the bag's ability to keep you warm. Also, these sleeping bags are quite heavy, so they aren't good for when weight is the top priority.

Our Top Ranking Sleeping Bags:
Product NameBrandSize
Best Overall Score
1
An image of Coleman Girls 40 Degree Polyester Sleeping Bag
Coleman Girls 40 Degree Polyester Sleeping Bag
Coleman
single
Runner Up
2
An image of Coleman 2000025288 Kids 40 Degree Sleeping Bag
Coleman 2000025288 Kids 40 Degree Sleeping Bag
Coleman
single
For Cold Weather
3
An image of Alps Mountaineering Cinch 4701442 40 Degree Nylon Sleeping Bag
Alps Mountaineering Cinch 4701442 40 Degree Nylon Sleeping Bag
Alps Mountaineering
single
Best Affordable Option
4
An image of Coleman Sunridge Men's 40 Degree Polyester Sleeping Bag
Coleman Sunridge Men's 40 Degree Polyester Sleeping Bag
Coleman
single
For Backpacking
5
An image of Naturehike Ultralight 40 Degree Down Sleeping Bag
Naturehike Ultralight 40 Degree Down Sleeping Bag
Naturehike
double
Our Top Ranking Sleeping Bags
Customer Rating
Brand
Coleman
Size
single
Customer Rating
Brand
Coleman
Size
single
Customer Rating
Brand
Alps Mountaineering
Size
single
Customer Rating
Brand
Coleman
Size
single
Customer Rating
Brand
Naturehike
Size
double
Best Overall Score
An image of Coleman Girls 40 Degree Polyester Sleeping Bag

If you're looking to purchase a sleeping bag for your children, you might want to consider the highly rated Coleman Girls 40 Degree Polyester Rectangular Sleeping Bag. This girls Coleman sleeping bag is a stylish, shorter option with less space at the bottom of the sleeping bag, keeping it more insulated. This sleeping bag has a rectangular shape, so kids will have room to move around. It has a polyester shell, which resists UV light, protecting your kids from damaging sun rays, and a polyester lining, which is a synthetic fabric that is very durable and vibrant.

This Coleman sleeping bag features a 40°F temperature rating, which is great for warm weather nights. It is perfect for camping, giving your kids the necessary protection to comfortably sleep outdoors after the temperatures drop at night. Made with Thermolock technology, it prevents heat loss through the zipper since it has an extra layer of insulation along the opening. It has a stuff sack, which will give your kids the perfect space to pack away their sleeping bag and any other small items. This sleeping bag features a zipper guard, keeping the fabric from snagging in the zipper.

    Pros
    • Zipper guard prevents the fabric from tearing
    • Stuff sack will keep your backpack organized
    • Polyester lining is strong and colorfast
    Cons
    • Polyester can stain easily
    • Rectangular shape is heavier than other shapes
    • Camping sleeping bags are bulkier than backpacking bags
Runner Up
An image of Coleman 2000025288 Kids 40 Degree Sleeping Bag

If you're looking to purchase a sleeping bag for your children, you will want to consider the highly rated Coleman Kids 40 Degree Rectangular Sleeping Bag. This kids sleeping bag is smaller, with less space at the foot of the sleeping bag, keeping it more insulated. This sleeping bag has a rectangular shape, which is spacious and offers more freedom of movement. It works well for camping trips, offering cozy warmth and good compressibility. This sleeping bag can withstand 40°F temperatures, keeping your kids warm on colder summer nights. It has Thermotech insulation, which is constructed from a low-density foam, which is non-toxic, very insulated, and moisture-absorbent.

This sleeping bag features a stuff sack, which will give your kids the perfect space to pack away their sleeping bag and any other small items. It features a glow in the dark design, which is a cool and fun way for kids to enjoy the outdoors. It features a roll control tab, which keeps the sleeping bag straight while packing it up. It is equipped with a zipper guard, keeping the material from snagging when opening and closing the zipper. With an interior pocket, it has a handy place to store small objects, such as glasses or a flashlight.

    Pros
    • Zipper guard prevents the fabric from tearing
    • Stuff sack will keep your backpack organized
    • Kids design is easy to transport
    Cons
    • Rectangular shape is not very insulated
    • Camping sleeping bags are more difficult to carry than backpacking bags
    • Stuff sack can damage the sleeping bag's filling if used for too long
For Cold Weather
An image of Alps Mountaineering Cinch 4701442 40 Degree Nylon Sleeping Bag

With the Alps Mountaineering Cinch 40 Degree Nylon Rectangular Sleeping Bag, you can experience an incredible night's sleep while on your weekend away. This sleeping bag is lightweight and is perfect for camping, offering cozy warmth without adding a lot of weight. It has a rectangular shape and a hammock design, so it surrounds the entire hammock, providing you with proper insulation and comfort. This sleeping bag features a nylon lining and is made with a nylon ripstop shell, so it resists wear and tear.

This Alps Mountaineering sleeping bag can withstand 40°F temperatures, keeping you warm on colder summer nights. It is designed to be compact and has a compressible design, leaving you enough extra space to bring along your other gear. This sleeping bag uses Techloft Micro-Insulation, so you will have maximized insulation and warmth because of tiny, silicone-coated, micro-denier fibers. It features a stuff sack, which takes up hardly any space and will make packing your bag so much easier.

    Pros
    • Made to be compact, getting rid of the bulk
    • Compresses easily
    • Stuff sack provides a spot to store loose items
    Cons
    • Nylon can fade easily
    • Rectangular shape is bulkier than other shapes
    • Camping sleeping bags are not suitable for hiking
Best Affordable Option
An image of Coleman Sunridge Men's 40 Degree Polyester Sleeping Bag

Looking for a sleeping bag on a budget? We can tell you about the Coleman Sunridge Men's 40 Degree Polyester Rectangular Sleeping Bag. This sleeping bag has a rectangular shape, which is spacious and offers more freedom of movement. It has a polyester exterior and a polyester lining, which is a synthetic material that is very durable and vibrant. Perfect for camping, it gives you insulation to comfortably sleep outdoors after the temperatures drop at night. It has a zipper guard, preventing the material from snagging when opening and closing the zipper. This sleeping bag has roll control and is made to be easy to pack, so it can be folded down into a practical size to save space in your bag. It has a 40°F temperature rating, keeping you warm on chilly summer nights.

    Pros
    • Roll control tab keeps the sleeping bag straight
    • Zipper guard prevents the material from ripping
    • Polyester lining is durable and colorfast
    Cons
    • Polyester can get dirty easily
    • Rectangular shape is not the warmest option
    • Camping sleeping bags are not suitable for hiking
For Backpacking
An image of Naturehike Ultralight 40 Degree Down Sleeping Bag

Sleep comfortably with the Naturehike Ultralight 40 Degree Down Rectangular Sleeping Bag. This Naturehike sleeping bag has a rectangular shape, allowing you to comfortably sleep on your side, back, or stomach without feeling restricted. With a double size, it will sleep two people, keeping you warm through shared body heat. It has a nylon ripstop exterior and a down lining, which will insulate you by trapping air and keeps your body heat in the sleeping bag, but remains breathable so you will not get too hot. Suitable for 3 seasons, it is best suited for summer, spring and fall trips. This Naturehike sleeping bag is ideal for temperatures around 40°F and is waterproof, resisting moisture and keeping you dry in rainy conditions. It is perfect for hiking and is lightweight, making long days out on the trail easier to tackle. This Naturehike sleeping bag features a compressible design and is made to be compact, so it can be rolled up very small, fitting conveniently wherever you pack it. It has a mesh storage bag, which allows for proper airflow to your things inside, so you don't have to worry about mildew or mold.

    Pros
    • Folds up compactly, helping you get rid of unnecessary bulk
    • Features a compressible design
    • Mesh storage bag prevents mildew or mold from growing
    Cons
    • Down loses insulation when wet
    • Rectangular shape is not very insulated
    • Double size will feel a bit heavier to bring on a hiking trip
For Sleeping Two
An image of Coleman Hampton Double 205140 40 Degree Cotton Flannel Sleeping Bag

Looking for a great camping sleeping bag? We can tell you about the Coleman Hampton Double 40 Degree Cotton Flannel Rectangular Sleeping Bag. This sleeping bag is available in a double size, giving more space to stretch out. It has a cotton exterior, so you won't overheat, as it's very strong, highly porous, and doesn't absorb sunlight, and a cotton flannel lining, which is great for colder climates as it is highly insulated. It has a rectangular shape, allowing you to comfortably sleep on your side, back, or stomach without feeling restricted. This 3 season Coleman sleeping bag is best suited for summer, spring and fall trips. This sleeping bag is suitable for camping, offering cozy warmth and good compressibility. It features a 40°F temperature rating, keeping you warm on colder summer nights.

    Pros
    • Cotton flannel lining allows for increased airflow
    • Cotton exterior doesn't absorb heat
    • Rectangular shape is built with extra space
    Cons
    • Rectangular shape is not very insulated
    • Camping sleeping bags are bulkier than backpacking bags
    • Cotton shell is heavy
Additional Picks
An image of Coleman Green Valley 40 Degree Cotton Flannel Sleeping Bag

With a high user rating, the Coleman Green Valley 40 Degree Cotton Flannel Rectangular Sleeping Bag could be exactly what you need for your next trip. This Coleman sleeping bag has a polyester shell and a cotton flannel lining, which enhances the warmth and prepares you for colder weather. It has a rectangular shape, allowing you to sleep on your side, back, or stomach without feeling restricted. This Coleman sleeping bag is equipped with a zipper guard, keeping the material from getting caught in the zipper. Perfect for camping, it gives you the necessary protection to comfortably sleep outdoors after the temperatures drop at night. It uses ComfortSmart technology, so it includes various comfort and convenience features such as zipper technology and added cushioning around your face. This sleeping bag can withstand 40°F temperatures, keeping you warm on chilly summer nights. It features a roll control tab and has a quick cord for convenient one-person packing.

    Pros
    • Quick cord for quick one-person packing
    • Zipper guard keeps the fabric from tearing
    • Cotton flannel lining allows for airflow
    Cons
    • Rectangular shape is not very insulated
    • Camping sleeping bags are bulkier than hiking bags
    • Polyester shell is not great for extreme weather camping
An image of Slumberjack Cub 52729712SR Boys 40 Degree Sleeping Bag

If you're looking for a sleeping bag for your kids, you will want to consider the highly rated Slumberjack Cub Boys 40 Degree Rectangular Sleeping Bag. This Slumberjack sleeping bag is made especially for boys, displaying a stylish design while keeping your children comfortable and warm. It has a rectangular shape, allowing kids to comfortably sleep on their side, back, or stomach without feeling restricted. It is equipped with a built-in pillowcase.

This Slumberjack sleeping bag has a 40°F temperature rating, which is ideal for warm weather nights. It has Slumberloft™ synthetic insulation, which utilizes polyester fibers in its core to create a high level of insulation. It has a stuff sack, which takes up hardly any space and will make packing so much easier. Featuring a pillow pocket, it has a convenient spot to store small objects, such as glasses or a book. It has a zipper guard, keeping the material from getting caught in the zipper.

    Pros
    • Features a built-in pillowcase
    • Zipper guard keeps the fabric from snagging
    • Stuff sack provides a place to store small items
    Cons
    • Rectangular shape is not very insulated
    • Stuff sack can ruin the sleeping bag's insulation after prolonged use
An image of Coleman Trinidad Kids 40 Degree Sleeping Bag

If you're looking for a sleeping bag for your children, you will want to consider the highly rated Coleman Trinidad Kids 40 Degree Rectangular Sleeping Bag. This kids Coleman sleeping bag provides comfort and warmth for your children since the shape is cut to their smaller size. This sleeping bag has a rectangular shape, so kids will have room to move around. It has a polyester shell, which is light and comfortable.

This sleeping bag is ideal for camping, offering cozy warmth without adding a lot of weight. With ComfortSmart technology, it includes multiple comfort and convenience features such as zipper technology and added cushioning around your kid's face. It is ideal for temperatures around 40°F, keeping your kids warm on chilly summer nights. Suitable for summer, it is built with a light design that focuses on airflow and ventilation, which is perfect for warmer temperatures.

This Coleman sleeping bag features a roll control tab, which keeps the sleeping bag in place while packing it up. It is made to be easy to pack, making it a wonderful option if mobility and space are your main concern. It has a quick cord, which is a no-tie closure making it easy to pack. It is machine washable and it is equipped with a zipper guard, keeping the fabric from snagging in the zipper.

    Pros
    • Can be machine washed
    • Quick cord makes it easy for one person to fold up the bag
    • Zipper guard prevents the material from tearing
    Cons
    • Rectangular shape is not very insulated
    • Camping sleeping bags are more difficult to carry than hiking bags
    • Polyester shell is not very durable
An image of Alps Mountaineering Spring Lake 4902122 40 Degree Microfiber Sleeping Bag

Let's review the Alps Mountaineering Spring Lake 40 Degree Microfiber Rectangular Sleeping Bag, a popular choice among consumers. This sleeping bag is designed for camping, offering cozy warmth and good compressibility. It features a microfiber lining and a nylon ripstop exterior, which does not absorb heat and is breathable and comfortable. It has a rectangular shape, which is non-tapered, allowing you freedom of movement in your sleep.

This sleeping bag is designed for summer, so you can stay comfortable with increased airflow during the warmer months. It is thermal and features a 40°F temperature rating, keeping you warm on colder summer nights. It has Techloft Micro-Insulation, so you will have maximized insulation and comfort because of tiny, silicone-coated, micro-denier fibers. This sleeping bag has a stuff sack, which will keep your backpack organized.

    Pros
    • Stuff sack will keep you organized
    • Nylon ripstop shell is light and comfortable
    • Suitable for warm summer temperatures
    Cons
    • Rectangular shape is not the warmest option
    • Camping sleeping bags are bulkier than backpacking bags
    • Stuff sack can ruin the sleeping bag's insulation if used for too long
Some More Information to Help You Decide on Your 40 Degree Rectangular Sleeping Bag:
Pros and Cons of Different Liner Materials for 40 Degree Rectangular Sleeping Bags
Fleece Sleeping Bags

We compared three awesome 40 degree rectangular sleeping bags that have a fleece liner to help you decide if this is the right material you want. These sleeping bags are designed to be insulated, giving you extra protection from any nasty icy drafts. They are very soft, ensuring your child sleeps soundly after a long day adventuring in the outdoors. Fleece sleeping bags are extremely durable, withstanding extended long term use and remaining intact. Designed for warmth, they will keep you snug and cozy. They dry quickly, so when facing wet conditions, they hardly absorb any moisture. Ready to decide on the right 40 degree rectangular sleeping bag for you? You can get started here.

Polyester Sleeping Bags

The following guide will help you know what to focus on when considering polyester sleeping bags. You can check out this 40 degree rectangular sleeping bag if this material is right for your outdoor excursions. These sleeping bags are naturally hypoallergenic, so they don't contain harmful substances that can cause discomfort for people with asthma or certain chemical sensitivities. They are designed with durable materials, providing a consistent level of warmth for longer. They are made with breathable material, allowing ample airflow so you don't get too hot. These sleeping bags are easy to clean, so you can keep them in great shape with just soap and water. They dry quickly, so even in the wettest conditions, they hardly absorb any moisture.

Down Sleeping Bags

Looking for a long-lasting sleeping bag? A sleeping bag with a down liner may be the perfect solution. To help you in your decision, we recommend one of the great 40 degree rectangular sleeping bags that come with a down liner. These sleeping bags can be easily compressed, so they don't require a significant amount of storage space when you are finished using it. They are designed to be insulated, so they retain your body heat very well, keeping you cozy regardless of the weather. Down sleeping bags are very comfortable, ensuring comfort and rest, no matter the surface underneath. Perfect for extra cold nights in the woods, they will keep you cozy and snug. They are designed with durable materials to withstand wear and tear. With great breathability, they won't stick to your skin and leave you feeling overheated on warmer nights. Now that you know more about down, choose the perfect one for you here.

40 Degree Rectangular Sleeping Bags Are Available in the Following Sizes
Double Sleeping Bags

Are double sleeping bags the right fit for you? Learn more about them in this paragraph and if you still want to check them out, then come take a look at this particular 40 degree rectangular sleeping bag that we picked out for you. Double sleeping bags are suitable for couples, offering a warm and cozy space for two. They come with a design that is good for car camping, which makes them great for when you'll be reaching the campsite with your vehicle, and not by foot. A potential downside is that they take up a bit more space, so they aren't recommended for backpacking pursuits.

Single Sleeping Bags

If you've been searching for a fitted and compact 40 degree rectangular sleeping bag, then you should keep reading below to find out more about them. Single sleeping bags have enough space for one, which provides excellent insulation to the sleeper inside. They weigh less than double sleeping bags, so they are more practical for taking on tough trails. These single sleeping bags are designed to be compact, so they'll fit easily in your pack, even if you are short on space. Now that you know about single sleeping bags, check out this highly rated 40 degree rectangular sleeping bag.