Top 40 Degree Sleeping Bags


Our review process

We've taken a look at over 800 sleeping bags, including plenty of different 40 degree sleeping bags. We used our leading artificial intelligence technology to rank each individual sleeping bag based on a number of data points. These features range from liner material and number of seasons to type and weight. The following article will talk about 40 degree sleeping bags in particular, of which we found 45. We hope that this guide will help you choose the best one for you.

We recommend you check out a 40 degree sleeping bag for your next camping adventure. 40 degree sleeping bags should keep you comfortable down to 40°F. They are generally cheaper than sub-zero degree bags, so you can buy these without feeling the stress of going over your budget. These sleeping bags are ideal for warm weather trips, so you won't feel stuffy and uncomfortable if a hot front comes through. They open completely, so they are easy to unzip at the top if you become overheated. They feature lighter weight than lower temperature rating bags, so they are more comfortable to carry long distances.

Our Top Ranking Sleeping Bags:
Product NameBrandShapeLiner MaterialSize
Best Overall Score
1
An image of Slumberjack Boundary 51726215LL Men's 40 Degree Polyester Taffeta Sleeping Bag
Slumberjack Boundary 51726215LL Men's 40 Degree Polyester Taffeta Sleeping Bag
Slumberjack
mummy
polyester taffeta
single
Runner Up
2
An image of Sierra Design Cloud 800 Men's 40 Degree Nylon Ripstop Sleeping Bag
Sierra Design Cloud 800 Men's 40 Degree Nylon Ripstop Sleeping Bag
Sierra Design
mummy
nylon ripstop
single
Best Affordable Option
3
An image of Coleman Girls 40 Degree Polyester Sleeping Bag
Coleman Girls 40 Degree Polyester Sleeping Bag
Coleman
rectangle
polyester
single
For Cold Weather
4
An image of Kelty Tuck 35425718RR 40 Degree Polyester Taffeta Sleeping Bag
Kelty Tuck 35425718RR 40 Degree Polyester Taffeta Sleeping Bag
Kelty
mummy
polyester taffeta
single
For Backpacking
5
An image of Sea to Summit Ember I 073R-Parent Men's 40 Degree Nylon Sleeping Bag
Sea to Summit Ember I 073R-Parent Men's 40 Degree Nylon Sleeping Bag
Sea to Summit
barrel
nylon
single
Our Top Ranking Sleeping Bags
Customer Rating
Brand
Slumberjack
Shape
mummy
Liner Material
polyester taffeta
Size
single
Customer Rating
Brand
Sierra Design
Shape
mummy
Liner Material
nylon ripstop
Size
single
Customer Rating
Brand
Coleman
Shape
rectangle
Liner Material
polyester
Size
single
Customer Rating
Brand
Kelty
Shape
mummy
Liner Material
polyester taffeta
Size
single
Customer Rating
Brand
Sea to Summit
Shape
barrel
Liner Material
nylon
Size
single
Best Overall Score
An image of Slumberjack Boundary 51726215LL Men's 40 Degree Polyester Taffeta Sleeping Bag

If you're looking for a new sleeping bag, you might want to consider the Slumberjack Boundary Men's 40 Degree Polyester Taffeta Mummy Sleeping Bag, which is rated very highly by online shoppers. Featuring a mummy shape, this Slumberjack sleeping bag is fitted to prevent cold air pockets. It can withstand 40°F temperatures, keeping you warm on chilly summer nights. This sleeping bag features a polyester taffeta lining, which does not retain water, keeping the material from getting too wet, and a polyester exterior, which resists UV light, shielding you from harmful sun rays. It features Slumberloft™ synthetic insulation, which uses polyester fibers to create a high level of insulation. This sleeping bag comes with a stuff sack, which will keep your pack organized.

    Pros
    • Stuff sack stores sleeping bags compactly
    • Polyester taffeta lining is naturally UV-resistant
    • Polyester shell is durable and colorfast
    Cons
    • Mummy shape has a tailored cut which can be too cramped for some
    • Polyester shell is not so durable
    • Stuff sack can damage the sleeping bag's filling if used for too long
Runner Up
An image of Sierra Design Cloud 800 Men's 40 Degree Nylon Ripstop Sleeping Bag

Choose the Sierra Design Cloud 800 Men's 40 Degree Nylon Ripstop Mummy Sleeping Bag to stay warm in the outdoors. With a mummy shape, this Sierra Design sleeping bag is tight fitting to prevent cold air pockets. It features a nylon ripstop shell, which is durable and not prone to absorbing moisture, and a nylon ripstop lining, which resists ripping due to strong reinforcement fibers that are woven through the material. This sleeping bag uses Dridown technology, so the air-trapping down clusters will be protected from moisture. It can withstand 40°F temperatures and is waterproof, keeping out moisture, so you won't end up soaked if bad weather hits. This 3 season Sierra Design sleeping bag is best suited for summer, spring and fall trips. It is designed for camping, offering cozy warmth and good compressibility. Equipped with a shoulder pocket, this Sierra Design sleeping bag has a convenient spot to store essentials.

    Pros
    • Nylon ripstop lining resists tearing
    • Nylon ripstop shell is light and comfortable
    • Mummy shape is excellent for backpacking
    Cons
    • Mummy shape limits sleeping positions
    • Camping sleeping bags are not suitable for hiking
    • 3 season sleeping bags can not be used all year
Best Affordable Option
An image of Coleman Girls 40 Degree Polyester Sleeping Bag

If you're looking to buy a sleeping bag for your children, you will want to consider the highly rated Coleman Girls 40 Degree Polyester Rectangular Sleeping Bag. This Coleman sleeping bag is made for girls, featuring a stylish design while keeping your children comfortable and warm. It has a rectangular shape, which is built with extra space, so kids can comfortably move around in a variety of sleeping positions. It features a polyester lining, which is a synthetic fabric that is very durable and colorfast, and a polyester shell, which is light and comfortable.

This sleeping bag is ideal for temperatures around 40°F, keeping your kids warm on chilly summer nights. Perfect for camping, it gives your kids the necessary protection to comfortably sleep outdoors after the temperatures drop at night. It uses Thermolock technology, preventing heat loss through the opening since it has an extra layer of insulation along the zipper. It features a stuff sack for conveniently fitting your kid's sleeping bag into their backpack along with the rest of their equipment. It 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
For Cold Weather
An image of Kelty Tuck 35425718RR 40 Degree Polyester Taffeta Sleeping Bag

Before purchasing the Kelty Tuck 40 Degree Polyester Taffeta Mummy Sleeping Bag, it's important to learn more about it. This Kelty sleeping bag has a mummy shape, sealing in your body heat since it is very fitted. It features a polyester shell and a polyester taffeta lining, which does not retain water, and dries out quickly if it comes in contact with water. It has ThermaPro insulation, which retains warmth by using ultra synthetic insulation. This Kelty sleeping bag is ideal for temperatures around 40°F, keeping you warm on colder summer nights.

This sleeping bag has a zipper guard, which keeps the fabric from catching in the zipper teeth. It is made to be compact and has a compressible design, so your sleeping bag will not take up a lot of room, leaving you with enough space to bring along your other equipment. The hood has drawstrings, so you can adjust the tightness based on what feels most comfortable to you. This sleeping bag has a stuff sack, which is the perfect size to store any small items.

    Pros
    • Designed to be compact
    • Compresses easily
    • Zipper guard keeps the fabric from tearing
    Cons
    • Mummy shape has a tailored fit which may not be comfortable for every sleeper
    • Polyester shell is not great for extreme weather camping
    • Stuff sack can ruin the sleeping bag's insulation after prolonged use
For Backpacking
An image of Sea to Summit Ember I 073R-Parent Men's 40 Degree Nylon Sleeping Bag

Trying to find a sleeping bag to take with you on the hiking trail? You'll want to know about the Sea to Summit Ember I Men's 40 Degree Nylon Barrel Sleeping Bag. This sleeping bag has a nylon lining, which will feel light and soft and will remain at a comfortable temperature, and a nylon ripstop exterior, which is hypoallergenic, repelling allergens to keep you allergy free. It is lightweight and works well for backpacking trips, so it is compact and easy to fit in your pack, making it comfortable to carry no matter the distance. It has a barrel shape, which is wider on the top and more loosely tapered by the feet, keeping you nice and warm while still giving you enough room to move around in your sleep. This sleeping bag features a 40°F temperature rating, which is great for warm weather nights. Featuring a compressible design, it fits easily into a hiking backpack or overnight bag. It is easy to pack and has a compression bag and a laundry bag for conveniently holding all of your dirty clothes in one place until the end of your trip.

    Pros
    • Features a compressible design
    • Easy to pack sleeping bags roll up compactly
    • Lightweight build
    Cons
    • Nylon can fade easily
    • Barrel shaped sleeping bags can be hard to fit into a backpack
For Sleeping Two
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 sleeping bag is waterproof and is ideal for temperatures around 40°F, keeping you warm on colder summer nights. 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
Additional Picks
An image of Snugpak Special Forces 1 91125MC Men's 40 Degree Paratex Light Sleeping Bag

Use the Snugpak Special Forces 1 Men's 40 Degree Paratex Light Mummy Sleeping Bag to stay warm in the outdoors. Featuring a mummy shape, this Snugpak sleeping bag is fitted to prevent cold air pockets. It can withstand 40°F temperatures, keeping you warm on chilly summer nights. This Snugpak sleeping bag features a paratex exterior, which is a ripstop fabric that is 100% waterproof, and a Paratex light lining, which will keep you sleeping cool and fresh due to the wicking properties of the interior fabric. It is made to be compact and has a compressible design, giving you enough extra space to bring along your other equipment. Perfect for military use, it is made to keep you warm and comfortable in even the roughest terrain. This Snugpak sleeping bag comes with a stuff sack, which will keep you organized.

    Pros
    • Folds up compactly
    • Made to compress easily
    • Stuff sack will keep your pack organized
    Cons
    • Mummy shape is close fitting with no extra room to move
    • Stuff sack can ruin the sleeping bag's filling if used for too long
An image of Coleman 2000025288 Kids 40 Degree Sleeping Bag

If you're looking for a sleeping bag for your kids, 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 bottom 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 has a stuff sack, designed for easily fitting your kid's sleeping bag into their backpack along with the rest of their equipment. It features a glow in the dark design, which is a fun and cool way for kids to enjoy the outdoors. It features a roll control tab, which keeps the sleeping bag straight while packing it up. This Coleman sleeping bag has a zipper guard, which keeps the fabric from tearing if caught in the zipper teeth. It has an interior pocket, which gives your kids a handy and secure spot to store their important possessions, such as a watch.

    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
An image of Slumberjack Latitude Lat40 Men's 40 Degree Sleeping Bag

You'll want to learn all about the Slumberjack Latitude Men's 40 Degree Mummy Sleeping Bag to discover what sets it apart from all the other sleeping bags on the market. This sleeping bag has a mummy shape, which is larger on top and more fitted by the feet, keeping warm air close to your body. It features Slumberloft™ synthetic insulation, which uses polyester fibers to create a high level of insulation. This Slumberjack sleeping bag features a 40°F temperature rating, which is ideal for warm weather nights. It is made for camping, giving you insulation to comfortably sleep outdoors after the temperatures drop at night. It has a zipper guard, preventing the fabric from snagging in the zipper. This sleeping bag has a stuff sack, which is the perfect size to store any small items.

    Pros
    • Zipper guard keeps the fabric from tearing
    • Stuff sack provides a spot to stash small items
    • Mummy shape has excellent insulation
    Cons
    • Mummy shape has a tight fit which can be uncomfortable for some people
    • Camping sleeping bags are not suitable for backpacking
    • Stuff sack can damage the sleeping bag's filling if used for too long
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 whole 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 features a compressible design, which will fold up very small, leaving you enough room for all your other essentials and it is also designed to be compact, getting rid of the bulk, so you'll have plenty of room for your gear. It has Techloft Micro-Insulation, so you will have maximized insulation and comfort because of tiny, silicone-coated, micro-denier fibers. This sleeping bag comes with a stuff sack, which will keep your backpack organized.

    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
How to Decide on Your New 40 Degree Sleeping Bag: Some Points to Keep In Mind:
Choosing a Size for 40 Degree Sleeping Bags
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 sleeping bag that we picked out for you. These sleeping bags are suitable for more than one person, offering a warm and cozy space for two. They are suitable for car camping, allowing you to sleep comfortably next to your camping partner in a snug and cozy space. One downside is that they take up a bit more space, making them less suitable for backpacking pursuits.

Single Sleeping Bags

We compared 37 different options for 40 degree sleeping bags that come in a single size to help you decide if this is the sleeping bag you want. These sleeping bags have enough space for one, keeping one person snug and warm when temperatures drop. They weigh less than double sleeping bags, so they are great for when you want to save space and move fast. They are designed to be compact, making them easy to roll up and throw in your bag. With this additional information about single size sleeping bags, check out this great 40 degree sleeping bag that we found.

Number of Seasons a 40 Degree Sleeping Bag Can Keep You Warm in
3 Season Sleeping Bags

If you can't decide between a winter and summer sleeping, you can settle in the middle and check out this great one. 3 season sleeping bags are suitable for most conditions, except for when there may be frost or snow on the ground, so they are a very versatile option for those who know they won't be camping out in extreme cold conditions. They have enough insulation for colder weather camping trips in spring through to autumn, which provides you with the comfort and warmth you need for taking on almost every season of the year.

4 Season Sleeping Bags

Are 4 season sleeping bags exactly what you're looking for? Learn more about them in this section and if you still want to check them out, then come take a look at this particular 40 degree sleeping bag that we picked out for you. 4 season sleeping bags feature an insulated hood that can be cinched in, which increases the level of protection against cold air penetrating the outer shell. However, they have more expensive price tag than 2 or 3 season sleeping bags, which may only be worth considering if you're looking to make more of a long-term investment. A benefit is that they are suitable for all winter weather, so you won't have the cold as an excuse for keeping you back from adventuring into the wilderness.

2 Season Sleeping Bags

Are 2 season sleeping bags the right fit for you? Learn more about them in this section and if you still want to check them out, then come take a look at this particular 40 degree sleeping bag that we chose for you. 2 season sleeping bags are good for warmer weather, so you won't feel sweaty and uncomfortable on humid or hot nights. They come with a lightweight design, so if you're worried about carrying too much weight, they could be a great option for you. They have good ventilation features, letting a comfortable flow of air through, so you wont get overheated at night. However, they have the least amount of weather protection, which won't offer the necessary weather protection for extreme cold.

Choosing the Perfect Shape for 40 Degree Sleeping Bags
Barrel Sleeping Bags

Looking to buy an all-purpose sleeping bag? We have four barrel sleeping bags available. Click here to take a look at one now. Barrel sleeping bags have a roomy design, so they are good for people who feel too claustrophobic by the tight mummy shape. They accommodate varying sleeping positions, giving you plenty of room to get comfortable, regardless of your sleeping position. They are cut a bit closer than rectangular bags, so they are a great choice for something spacious while not compromising warmth.

Rectangular Sleeping Bags

Deciding on the most fitting rectangle sleeping bag for you? We'll help you make your choice by providing you with the information that you need. Rectangular sleeping bags have a roomy design, so they are good for people who feel too claustrophobic by the tight mummy shape. They accommodate varying sleeping positions, so if you move around a lot at night, you'll have the space and freedom to sleep in any position you choose. They have double zippers, making them very versatile, doubling as a blanket or attaching to another sleeping bag for combined body heat on extra cold nights. Something to keep in mind is that they are not very heat-efficient, allowing the cool air to circulate due to their spacious design. Another drawback is that they are quite heavy, so they are less suitable for when weight is the top priority. Think you know which shape is right for you? Then why not start by looking at this exciting option.

Mummy Sleeping Bags

Trying to decide on the most fitting mummy sleeping bag for your next outdoor adventure? We can help you make up your mind by providing you with some important information that you need. Mummy sleeping bags weigh less than rectangular bags, so they are best when you need maximum warmth and minimal weight. A potential downside is that they provide less space to move around, making them uncomfortable for sleepers who toss and turn. A benefit is that they are good for cold weather, so they are designed to hold in warmth and keep out cold drafts. Think you know which shape is perfect for you? Then have a look at this exciting product.