Best Waterproof 40 Degree Sleeping Bags


Our review process

We have collected, researched, and analyzed information on hundreds of different types of sleeping bags in order to recommend our highest ranked sleeping bags on the market. We then further sub-categorized them and looked more specifically at 8 different waterproof 40 degree sleeping bags. In our research, we took into consideration a range of different main features among the 28,000 different data parameters and combined it with customer reviews to inform you of the top waterproof 40 degree sleeping bags available on the market. But don't just take our word for it, check out some of the advantages and disadvantages of some of the main specs.

We've reviewed waterproof 40 degree sleeping bags and want to let you in on a few things. 40 degree sleeping bags should keep you comfortable down to 40°F. They open completely, allowing you to unzip them for ventilation on warm nights. They are ideal for warm weather trips, providing comfortable ventilation and breathability for hotter nights. 40 degree sleeping bags are more affordable than sub-zero degree bags, making them suitable if you're shopping on a budget. They are typically lighter, so they might not provide the highest degree of insulation, but what they don't have in terms of insulation, they make up for in their weight. They protect against rain getting inside your bag, keeping out condensation so you'll be warm throughout the night. Waterproof sleeping bags are treated with a water repellent coating, allowing water droplets to bead and roll off the surface, so you'll stay completely dry inside.

Our Top Ranking Sleeping Bags:
Product NameBrandShapeSize
Best Overall Score
1
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
single
Runner Up
2
An image of Alps Mountaineering Fusion 4300433 40 Degree Sleeping Bag
Alps Mountaineering Fusion 4300433 40 Degree Sleeping Bag
Alps Mountaineering
mummy
single
Best Affordable Option
3
An image of Marmot Voyager 45 Men's 40 Degree Sleeping Bag
Marmot Voyager 45 Men's 40 Degree Sleeping Bag
Marmot
mummy
For Cold Weather
4
An image of Naturehike 40 Degree Nylon Ripstop Sleeping Bag
Naturehike 40 Degree Nylon Ripstop Sleeping Bag
Naturehike
mummy
single
For Backpacking
5
An image of Naturehike Ultralight 40 Degree Down Sleeping Bag
Naturehike Ultralight 40 Degree Down Sleeping Bag
Naturehike
rectangle
double
Our Top Ranking Sleeping Bags
Customer Rating
Brand
Sierra Design
Shape
mummy
Size
single
Customer Rating
Brand
Alps Mountaineering
Shape
mummy
Size
single
Customer Rating
Brand
Marmot
Shape
mummy
Size
Customer Rating
Brand
Naturehike
Shape
mummy
Size
single
Customer Rating
Brand
Naturehike
Shape
rectangle
Size
double
Best Overall Score
An image of Sierra Design Cloud 800 Men's 40 Degree Nylon Ripstop Sleeping Bag

Let's review the Sierra Design Cloud 800 Men's 40 Degree Nylon Ripstop Mummy Sleeping Bag, a popular choice among online shoppers. This Sierra Design sleeping bag is built with a nylon ripstop shell and features a nylon ripstop lining, resisting ripping due to strong reinforcement threads that are woven through the material. With a mummy shape, it is made for optimal warmth-to-weight ratio, since it is cut closely so there isn't extra fabric, cutting down on the weight and making it easier to carry on your back. It has Dridown technology, which uses many short fibers to efficiently trap heat, while giving off a very soft feel that is very comfortable. This Sierra Design sleeping bag works well for camping trips, offering cozy warmth without adding a lot of weight. Suitable for 3 seasons, it is best suited for summer, spring and fall trips. This sleeping bag includes a shoulder pocket, so you can stash your valuable and small items, such as your phone. It is waterproof and is ideal for temperatures around 40°F, keeping you warm on chilly summer nights.

    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
Runner Up
An image of Alps Mountaineering Fusion 4300433 40 Degree Sleeping Bag

Let's review the Alps Mountaineering Fusion 40 Degree Mummy Sleeping Bag, a popular choice among consumers. Designed from nylon ripstop shell material, this Alps Mountaineering sleeping bag works well in rugged use since it won't rip or tear. Featuring a mummy shape, it is tight fitting to prevent warm air from escaping. It has a compressible design, so it fits easily into a hiking backpack or overnight bag. This Alps Mountaineering sleeping bag uses Techloft Micro-Insulation, so you will have increased insulation and comfort because of tiny, silicone-coated, micro-denier fibers. It is perfect for camping and is lightweight, making long days out on the trail easier to tackle. This Alps Mountaineering sleeping bag can withstand 40°F temperatures and is waterproof, keeping out moisture, so you won't end up soaked if bad weather hits. It features a stuff sack, which will keep your bag organized. Its hood is designed with drawstrings, so you can adjust the fit based on the temperature outside.

    Pros
    • Compresses easily
    • Drawstring hood gives added comfort by the head
    • Stuff sack stores sleeping bags easily
    Cons
    • Mummy shape is close fitting with no extra room to move around
    • Camping sleeping bags are not suitable for hiking
    • Stuff sack can ruin the sleeping bag's filling if used for too long
Best Affordable Option
An image of Marmot Voyager 45 Men's 40 Degree Sleeping Bag

Choose the Marmot Voyager 45 Men's 40 Degree Mummy Sleeping Bag to stay warm in the outdoors. This sleeping bag works well for hiking trips, so if weight is your priority this could be a great option. It has a mummy shape, which is larger on top and more tapered by the feet, keeping warm air closer to you. This sleeping bag features a polyester shell, which is breathable and comfortable.

This sleeping bag has a compressible design, so you can fit it into your backpack and it will give you sufficient space to take along other equipment. It is ideal for temperatures around 40°F and is waterproof, making it a good choice for wet environments. This sleeping bag has Spirafil insulation, which combines large, hollow fibers with small, polyester fibers to create a unique blend of durability, warmth, and comfort. It features a mummy-style hood, which fits snugly over your head, helping keep you warm by trapping body heat. It features a stuff sack and comes with a two-way zipper, so you can easily control the airflow inside the sleeping bag.

    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

If you're looking for a new sleeping bag, you will want to consider the Naturehike 40 Degree Nylon Ripstop Mummy Sleeping Bag. This Naturehike sleeping bag features a nylon ripstop lining, which resists tearing due to strong reinforcement fibers that are woven through the fabric, and a nylon ripstop exterior, which works well for extensive use since it won't rip or tear. It has a mummy shape, which is larger on top and more fitted on the bottom, keeping warm air inside the sleeping bag. Perfect for year-round adventuring, it is built with strong materials that are highly insulated and shield against extremely cold temperatures. It is lightweight and is suitable for backpacking, so it is compact and easy to fit in your pack, making it comfortable to carry no matter the hiking trail. This Naturehike sleeping bag is designed to be compact and has a compressible design, so your sleeping bag will not take up too much room, leaving you with sufficient space to bring along your other essentials. It can withstand 40°F temperatures and is waterproof, keeping out moisture, so you won't end up soaked if it starts raining. This Naturehike sleeping bag features a stuff sack, which will keep your backpack organized. It features a mummy-style hood, which fits snugly over your head, helping keep you warm by trapping body heat.

    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 Backpacking
An image of Naturehike Ultralight 40 Degree Down Sleeping Bag

Choose the Naturehike Ultralight 40 Degree Down Rectangular Sleeping Bag to stay warm and cozy in the outdoors. This Naturehike sleeping bag has a rectangular shape, which is ideal for those who like room to stretch out. It has a nylon ripstop shell and a down lining, which cushions you by trapping air and keeps your body heat inside the sleeping bag, but still remains breathable so you will not get too hot. It is intended for two sleepers.

This Naturehike sleeping bag is lightweight and is ideal for backpacking, so if weight is your priority this could be a great option. Suitable for 3 seasons, it is best suited for summer, spring and fall trips. It features a compressible design and is made to be compact, so it can be rolled up very small, fitting conveniently wherever you tale it. This sleeping bag has a mesh storage bag, which will hold your bag or other loose items. It is waterproof and features a 40°F temperature rating, keeping you warm on chilly summer nights.

    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 Marmot Voyager 45 900718-2772 Men's 40 Degree Polyester Sleeping Bag

Let's review the Marmot Voyager 45 Men's 40 Degree Polyester Mummy Sleeping Bag, rated highly by online shoppers. This sleeping bag has a polyester exterior, which resists UV light, protecting you from harmful sun rays, and a polyester lining, which is light and soft on your skin and does not get as hot as other materials during the night. With a mummy shape, it is made with maximum warmth-to-weight ratio, since it is fitted so there is no excess material, cutting down on the weight and making it easier to carry on your back. It features Spirafil insulation, which mixes large, hollow fibers with small, polyester fibers to create a blend of durability, warmth, and softness. Perfect for backpacking, it won't add noticeable weight to your bag while you're taking on the outdoors. This sleeping bag has a compressible design, giving you enough extra space to take along your other gear. It features a stuff sack and a two-way zipper, so you can conveniently control the airflow inside the sleeping bag. This sleeping bag is ideal for temperatures around 40°F and is waterproof, resisting moisture and keeping you dry in damp conditions.

    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
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 Columbia Sportswear Girls 40 Degree Polyester Fleece Sleeping Bag

If you're looking for a sleeping bag for your children, you might want to consider the highly rated Columbia Sportswear Girls 40 Degree Polyester Fleece Rectangular Sleeping Bag. This Columbia 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 fleece lining, which will hold in warmth, resists wetness, and is very soft, and a polyester shell, which resists UV light, protecting your kids from damaging sun rays.

This Columbia sleeping bag is waterproof, keeping out moisture, so your kids won't end up soaked if bad weather hits. With a lightweight build, it won't be hard for your kids to carry. It features a 40°F temperature rating, which is great for warm weather nights. It features a drawstring carry bag, which is hands free and easy for your kids to bring with them on any adventure.

    Pros
    • Lightweight construction
    • Polyester exterior resists UV rays
    • Rectangular shape offers you room to move around
    Cons
    • Rectangular shape is not very insulated
    • Polyester exterior is not great for extreme weather camping
Waterproof 40 Degree Sleeping Bags: Here's Some More Information To Think About:
Thinking About Seasonality for 40 Degree Sleeping Bags
3 Season Sleeping Bags

Do you like camping outside in the summer, spring, and fall but prefer to stay indoors in the winter months? Check out this great one. 3 season sleeping bags have enough insulation for colder weather camping trips in spring through to autumn, which provides you with the comfort and warmth you need for sleeping outside during almost every season. Keeping you warm in most conditions except for snow, they are extremely versatile and will provide you with the insulation you need, unless you're planning on going on an extreme alpine winter expedition.

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 chose for you. 4 season sleeping bags are designed with an insulated hood that can be cinched down around your head, providing you with even more warmth. However, they feature more expensive price tag than 2 or 3 season sleeping bags, which might not be worth the purchase if you don't plan on going winter camping. A benefit is that they have extra insulation for sleeping outdoors in all four seasons, which handle extreme cold so you can sleep out in even the coldest months.

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

It can be hard to decide on the right size for your 40 degree sleeping bag. We're here to help you think about the perfect choice for you. Double sleeping bags have a design that is great for two people, which makes 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. Now that you are better informed regarding double sleeping bags, check out this great 40 degree sleeping bag.

Single Sleeping Bags

We found six 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. 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. They are designed to be compact, so you don't have to spend time in the morning fussing to get it to fit in your bag. Now that you know about single sleeping bags, check out this great 40 degree sleeping bag.

Pros and Cons of Different Liner Materials for 40 Degree Sleeping Bags
Polyester Sleeping Bags

Looking for a warm sleeping bag? A sleeping bag with a polyester liner may be the solution you want. For your convenience, we recommend one of the great 40 degree sleeping bags that come with a polyester liner. 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 easy to clean, so they can last a long time before needing a complete wash. They are breathable, so whether it's a colder or warmer night, you'll feel comfortable sleeping in a variety of outdoor temperatures. They are designed with durable materials, so they will not pill or tear with extended use. They dry quickly, so when facing wet conditions, they hardly absorb any moisture. Ready to choose the right 40 degree sleeping bag for you? Get started here.

Down Sleeping Bags

We looked at two awesome 40 degree sleeping bags that have a down liner to help you decide if this is the right material you want. Down sleeping bags can be easily compressed, so they don't require a lot 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. They are designed for warmth, so cold temperatures won't keep you from an epic outdoor adventure. They are breathable, so heat is distributed evenly, making them suitable when the weather forecast is unpredictable. They are very soft, so you'll wake up feeling well rested. They are designed with durable materials, so they will not pill or tear with extended use. Ready to pick out the right 40 degree sleeping bag for you? You can get started here.

Nylon Ripstop Sleeping Bags

There is only one 40 degree sleeping bag that has a nylon ripstop liner. Nylon ripstop sleeping bags are extremely durable, so no matter how many times they go in the wash, they won't pill or unravel. They are breathable, causing the temperature inside your bag to stay comfortable and balanced. They are moisture wicking, keeping you dry on humid nights. Now that you know more about nylon ripstop, take a look here.