Unbiased 40 Degree Backpacking Sleeping Bags Review


Our review process

Our team has collected, researched, and analyzed information on plenty of various kinds of sleeping bags in order to recommend our top rated sleeping bags on the market. We then further sub-categorized them and looked more specifically at 9 different 40 degree backpacking sleeping bags. In our research, we took into consideration a large range of different key features among the 28,000 different data parameters and combined it with customer reviews to inform you of the finest 40 degree backpacking 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.

We've taken a look at 40 degree backpacking sleeping bags and wanted to let you know about both the pros and cons. 40 degree sleeping bags should keep you comfortable down to 40°F. They open completely, allowing you to unzip them or to just use as a quilt on really warm nights. These sleeping bags are more affordable than sub-zero degree bags, making them ideal if you're shopping on a budget. They are ideal for warm weather trips, so they help vent heat, keeping you cool if a hot front comes through. 40 degree sleeping bags are typically lighter, so they are more comfortable to carry long distances.

Backpacking sleeping bags feature a lightweight design, making long days out on the trail easier to handle. They pack down smaller, so they are excellent when it comes to portability. They are designed for maximum warmth, so they are better insulated and keep in your body heat. Backpacking sleeping bags are designed to withstand a variety of climates and terrains, standing up to wear and tear for those extreme outdoor trips.

Our Top Ranking Sleeping Bags:
Product NameBrandShapeColorSize
Best Overall Score
1
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
gray and yellow
single
Runner Up
2
An image of Marmot Voyager 45 Men's 40 Degree Sleeping Bag
Marmot Voyager 45 Men's 40 Degree Sleeping Bag
Marmot
mummy
sapphire
For Cold Weather
3
An image of Naturehike 40 Degree Nylon Ripstop Sleeping Bag
Naturehike 40 Degree Nylon Ripstop Sleeping Bag
Naturehike
mummy
blue and black
single
For Sleeping Two
4
An image of Naturehike Ultralight 40 Degree Down Sleeping Bag
Naturehike Ultralight 40 Degree Down Sleeping Bag
Naturehike
rectangle
dark blue
double
Best Affordable Option
5
An image of Marmot Voyager 45 900718-2772 Men's 40 Degree Polyester Sleeping Bag
Marmot Voyager 45 900718-2772 Men's 40 Degree Polyester Sleeping Bag
Marmot
mummy
sapphire
single
Our Top Ranking Sleeping Bags
Customer Rating
Brand
Sea to Summit
Shape
barrel
Color
gray and yellow
Size
single
Customer Rating
Brand
Marmot
Shape
mummy
Color
sapphire
Size
Customer Rating
Brand
Naturehike
Shape
mummy
Color
blue and black
Size
single
Customer Rating
Brand
Naturehike
Shape
rectangle
Color
dark blue
Size
double
Customer Rating
Brand
Marmot
Shape
mummy
Color
sapphire
Size
single
Best Overall Score
An image of Sea to Summit Ember I 073R-Parent Men's 40 Degree Nylon Sleeping Bag

With the Sea to Summit Ember I Men's 40 Degree Nylon Barrel Sleeping Bag, you can experience a great night's sleep while on your weekend getaway. This sleeping bag has a nylon lining and is made with a nylon ripstop shell, resisting typical wear and tear. It has a barrel shape, which is tapered from top to bottom to increase heat efficiency and save weight. It is lightweight and works well for hiking trips, so if weight is your priority this could be a great option. With a compressible design, it fits easily into a hiking backpack or overnight bag. This sleeping bag is ideal for temperatures around 40°F, keeping you warm on chilly summer nights. It is easy to pack, so it can be folded into a practical size to save space in your bag. It has a laundry bag and features a compression bag, which will make storing your sleeping bag super easy.

    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
Runner Up
An image of Marmot Voyager 45 Men's 40 Degree Sleeping Bag

Trying to find a sleeping bag on a budget? You'll want to know about the Marmot Voyager 45 Men's 40 Degree Mummy Sleeping Bag. With a mummy shape, this Marmot sleeping bag is fitted to prevent warm air from escaping. It features Spirafil insulation, which mixes large, hollow fibers with small, polyester fibers to create a blend of durability, warmth, and comfort. This sleeping bag can withstand 40°F temperatures and is waterproof, making it a good fit for wet environments. It has a polyester shell, which will resist UV light, protecting you from harmful sunlight.

With a mummy style, the hood will keep your head and neck extremely warm, since the cut leaves only your mouth and nose exposed. This Marmot sleeping bag features a compressible design, leaving you enough extra space to take along your other essentials. It is perfect for hiking, so if you don't want to carry a lot of weight this could be a great choice for you. It features a two-way zipper and a stuff sack, which is the perfect size to conveniently store your sleeping bag and any other small items.

    Pros
    • Made to compress easily
    • Mummy-style hood traps body heat
    • Two-way zipper provides airflow by your feet
    Cons
    • Mummy shape is only suitable for back sleepers
    • Polyester exterior is not very durable
For Cold Weather
An image of Naturehike 40 Degree Nylon Ripstop Sleeping Bag

Looking for your next backpacking sleeping bag? We can tell you about the Naturehike 40 Degree Nylon Ripstop Mummy Sleeping Bag. This Naturehike sleeping bag is lightweight and is ideal for backpacking, so if you don't want to carry a lot of weight this could be a great choice for you. It has a mummy shape, sealing in your body heat since it is very fitted. This Naturehike sleeping bag features a nylon ripstop lining, which resists tearing due to thick reinforcement threads that are woven through the fabric, and a nylon ripstop exterior, which will resist wear and tear and potential holes or rips.

This 4 season Naturehike sleeping bag can handle very cold conditions or areas with strong winds. This Naturehike sleeping bag can withstand 40°F temperatures and is waterproof, making it a good choice for rainy conditions. 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. It has a mummy-style hood, which fits tightly over your head, helping keep you warm by trapping body heat. This Naturehike sleeping bag features a stuff sack, which will keep your pack organized.

    Pros
    • Folds up compactly
    • Features a compressible design
    • Mummy-style hood traps body heat
    Cons
    • Mummy shape limits different sleeping positions
    • 4 season sleeping bags are heavier
    • Stuff sack can ruin the sleeping bag's filling if used for too long
For Sleeping Two
An image of Naturehike Ultralight 40 Degree Down Sleeping Bag

Trying to find your next backpacking sleeping bag? You'll want to hear all about the Naturehike Ultralight 40 Degree Down Rectangular Sleeping Bag. This Naturehike sleeping bag is lightweight and is ideal for backpacking, so if you don't want to carry a lot of weight this could be a great choice for you. It has a rectangular shape, so you will have plenty of room to move around in your sleep. This Naturehike sleeping bag is designed with a down lining and has a nylon ripstop exterior, so it resists wear and tear. Designed in a double size, it will fit two campers, keeping you warm by sharing body heat.

This Naturehike sleeping bag is made to be compact and has a compressible design, giving you sufficient extra space to bring along your other essentials. This 3 season Naturehike sleeping bag is best suited for summer, spring and fall trips. It is waterproof and has a 40°F temperature rating, keeping you warm on chilly summer nights. It features 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
Best Affordable Option
An image of Marmot Voyager 45 900718-2772 Men's 40 Degree Polyester Sleeping Bag

Get a good night's sleep with the Marmot Voyager 45 Men's 40 Degree Polyester Mummy Sleeping Bag. This sleeping bag has a mummy shape, which is wider on top and more fitted on the bottom, keeping warm air close to your body. It works well for hiking trips, so if weight is your priority this could be a great option. It has a polyester shell and a polyester lining, which is breathable and comfortable on your skin and does not heat up as much as other materials during the night.

This Marmot sleeping bag has a compressible design, so you can fold it into your backpack and it will give you sufficient room to bring along other gear. It has a 40°F temperature rating and is waterproof, resisting moisture and keeping you dry in rainy conditions. This sleeping bag has Spirafil insulation, which mixes large, hollow fibers with small, polyester fibers to create a blend of loft, warmth, and softness. It features a stuff sack and has a two-way zipper, so you can easily control the temperature while you sleep.

    Pros
    • Designed to compress easily
    • Stuff sack provides a spot to store small items
    • Polyester lining is durable and colorfast
    Cons
    • Polyester stains easily
    • Mummy shape limits different sleeping positions
    • Polyester exterior is not very durable
Additional Picks
An image of Mountain Hardwear Ghost 40 Degree Sleeping Bag

Use the Mountain Hardwear Ghost 40 Degree Mummy Sleeping Bag to stay warm in the outdoors. Featuring a mummy shape, this Mountain Hardwear sleeping bag is made for optimal warmth-to-weight ratio, since it is fitted so there is no extra fabric, cutting down on the weight and making it easier to carry on your back. Designed from nylon ripstop shell material, it works well in extensive use since it won't tear or rip. It uses Q.Shield down, coating the down fibers with durable water repellent, so contact with water will not hinder the insulation level. This Mountain Hardwear sleeping bag is lightweight and is perfect for backpacking, so it is compact and easy to fit in your pack, making it comfortable to carry no matter the hiking trail. It is waterproof and features a 40°F temperature rating, keeping you warm on chilly summer nights.

    Pros
    • Lightweight construction reduces the weight of your bag
    • Nylon ripstop shell is breathable and comfortable
    • Mummy shape has great insulation
    Cons
    • Mummy shape restricts different sleeping positions
An image of Marmot NanoWave 45 21480-6278-L 40 Degree Polyester Sleeping Bag

You'll want to discover more about the Marmot NanoWave 45 40 Degree Polyester Mummy Sleeping Bag to discover what sets it apart from all the other sleeping bags on the market. With a mummy shape, this sleeping bag is tight fitting to prevent warm air from escaping. It features a 40°F temperature rating, keeping you warm on chilly summer nights. It has Spirafil insulation, which combines large, hollow fibers with small, polyester fibers to create a blend of loft, warmth, and comfort. This sleeping bag has a polyester exterior and a polyester lining, which is light and soft on your skin and does not get as hot as other materials during the night.

This sleeping bag is suitable for backpacking and is lightweight, making it great for hiking or traveling long distances on foot. Featuring a compressible design, it does not take up all the space in your bag so you will have sufficient room to bring along other gear. It detaches via zippers and is equipped with a zipper guard, preventing the fabric from snagging in the zipper. It has a stuff sack for conveniently fitting your sleeping bag into your backpack with the rest of your gear.

    Pros
    • Made to compress easily
    • Zipper guard prevents the material from catching
    • Stuff sack provides space to store small items
    Cons
    • Polyester absorbs sweat
    • Mummy shape is close fitting with no extra space to move
    • Polyester exterior is not very durable
An image of Snugpak Softie Elite 1 92808 40 Degree Sleeping Bag

Looking for your next backpacking sleeping bag? We can tell you about the Snugpak Softie Elite 1 40 Degree Sleeping Bag. This Snugpak sleeping bag features Reflectatherm, which will prevent wetness from building up inside your sleeping bag. It has a polyester exterior, which will resist UV light, protecting you from damaging sunlight. It is ideal for temperatures around 40°F, keeping you warm on chilly summer nights.

This Snugpak sleeping bag features a compressible design and is made to be compact, getting rid of the bulk, so you'll have plenty of room for your gear. It is lightweight and is suitable for hiking, so it is compact and easy to fit in your bag, making it comfortable to carry no matter the distance. Equipped with a chest pocket, it has a convenient spot to store essentials. It has an easy access tab, so you can get in and out effortlessly.

    Pros
    • Designed to be compact, helping you get rid of bulk
    • Made to compress easily
    • Lightweight construction
    Cons
    • Polyester exterior is not so durable
An image of Columbia Men's 40 Degree Polyester Pongee Sleeping Bag

Looking for a sleeping bag on a budget? You'll want to hear about the Columbia Men's 40 Degree Polyester Pongee Mummy Sleeping Bag. This Columbia sleeping bag has a mummy shape, sealing in your body heat since it is very fitted. It has a polyester pongee lining, which will maximize air circulation as it's a thin, soft, breathable fabric, and a polyester exterior, which is breathable and comfortable. It can be machine washed, so you can easily clean it at home to make sure your bag stays in the best condition. This 4 season sleeping bag is built with durable materials that are highly insulated and shield against extremely cold temperatures. This Columbia sleeping bag is lightweight and is suitable for backpacking, so if weight is your priority this could be a great option. It can withstand 40°F temperatures, keeping you warm on colder summer nights.

    Pros
    • Can be machine washed
    • Lightweight build
    • Polyester exterior is durable and colorfast
    Cons
    • Mummy shape is very fitted with no extra room to move around
    • Polyester shell is not so durable
    • 4 season sleeping bags are bulkier
Choosing the Right 40 Degree Backpacking Sleeping Bag For You:
What Types of Liner Materials Are Available for 40 Degree Backpacking Sleeping Bags?
Polyester Sleeping Bags

Looking for a warm sleeping bag? A sleeping bag with a polyester liner may be the solution you want. To help you in your decision, we recommend one of the great 40 degree backpacking sleeping bags that come with a polyester liner. Polyester sleeping bags are naturally hypoallergenic, so you can stay protected against irritation from allergens and chemicals while taking on the outdoors. They are extremely durable, so they can stand up to extended use without fraying or falling part. Polyester sleeping bags are breathable, promoting steady airflow so you don't get too hot. They are easy to clean, so they can go many years before needing a complete wash. These sleeping bags dry quickly, so even in the wettest conditions, moisture will not soak the fabric. Now that you know more about polyester, take a look here.

Down Sleeping Bags

There is only one 40 degree backpacking sleeping bag that has a down liner. These down sleeping bags are designed to be insulated, so they retain your body heat very well, keeping you warm regardless of the weather. They can be easily compressed, giving you extra room for all the gear you need for your trip so you won't feel limited on space when packing. They are extremely durable, providing a consistent level of warmth for many years. These sleeping bags are designed for warmth, sealing out the cold on chilly nights. Made with breathable material, they won't stick to your skin and leave you feeling overheated on warmer nights. Down sleeping bags are very comfortable, ensuring comfort and rest, so you'll sleep happier than in your own bed. Ready to choose the right 40 degree backpacking sleeping bag for you? You can get started here.

Nylon Ripstop Sleeping Bags

There is only one 40 degree backpacking sleeping bag that has a nylon ripstop liner. Made with breathable material, nylon ripstop sleeping bags won't stick to your skin and make you feel overheated on warmer nights. They are extremely durable, providing a consistent level of warmth for many years. They are moisture wicking, keeping you dry on humid nights. Feel ready to choose the right 40 degree backpacking sleeping bag for you? You can get started here.

Check Out the Various Shapes for 40 Degree Backpacking Sleeping Bags
Barrel Sleeping Bags

Trying to decide on the most suitable barrel sleeping bag for your next outdoor adventure? We'll help you make up your mind by giving you the facts. With a spacious design, barrel sleeping bags are optimal for those who like a bit of extra room to stretch out. They accommodate varying sleeping positions, allowing you to sleep in any position without compressing the insulation. They are a great compromise between the more fitted mummy shape and the roomier rectangular sleeping bags, so they are a great choice for something spacious while not compromising warmth. Decided on which shape is right for you? Then have a look at this fantastic option.

Rectangular Sleeping Bags

Trying to choose the most suitable rectangle sleeping bag for your next outdoor adventure? We can help you decide by giving you the facts. Roomy and spacious, rectangular sleeping bags are ideal for those who like a bit of extra room to stretch out. They feature double zippers, making them very versatile, doubling as a blanket or attaching to another sleeping bag for combined body heat on extra cold nights. They accommodate varying sleeping positions, giving you plenty of room to get comfortable, regardless of your sleeping position. Something to keep in mind is that they are less ideal for cold weather, creating more room inside which can weaken the bag's ability to keep you warm. Additionally, they are quite heavy, so they aren't suitable for when weight is a concern. Think you know which shape is right for you? Then why not have a look at this fantastic product.

Mummy Sleeping Bags

Trying to choose the most fitting mummy sleeping bag for you? We'll help you decide by providing you with the information that you need. Mummy sleeping bags weigh less than rectangular bags, providing excellent insulation per unit weight. A potential downside is that they provide less space to move around, making them less suitable for sleepers who toss and turn. On the other hand, they are good for cold weather, so they are designed to hold in warmth and keep out cold drafts. Decided on which shape is right for you? Then have a look at this exciting option.

Which Size Is Best for Your 40 Degree Backpacking Sleeping Bags?
Double Sleeping Bags

Are double sleeping bags the best choice 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 backpacking sleeping bag that we picked out for you. These double sleeping bags are suitable for more than one person, making them great for winter getaways. They are suitable for car camping, so you'll sleep better when you're not constricted and weight isn't an issue. One downside is that they take up a lot of space, so they are less compact and harder to carry on your back.

Single Sleeping Bags

We looked at six different options for 40 degree backpacking sleeping bags that come in a single size to help you decide if this is the sleeping bag you want. Single sleeping bags are lighter than double sleeping bags, so they are great for when you want to save space and move fast. They have enough space for one, providing excellent insulation to the sleeper inside. They provide a compact packing solution, so you don't have to spend time in the morning fussing to get it to fit in your bag. Now that you are better informed about single sleeping bags, check out this highly ranked 40 degree backpacking sleeping bag.