Herbie Murray
When it comes to outdoor adventures, a good night's sleep is essential. A sleeping bag that is both lightweight and warm can be the difference between a miserable night and a great adventure. The best ultralight sleeping bags will keep you warm without adding bulk to your backpack. Whether you're a fastpacker or a backpacker, there are a variety of options available. From the Feathered Friends Flicker UL 20 Quilt Sleeping Bag to the Western Mountaineering HighLite, these bags offer versatility and comfort for various temperatures. The lightest option is the Therm-a-Rest Vesper 32 quilt, weighing only 15 ounces, while the Feathered Friends Swallow UL 20/30 Sleeping Bag is the warmest tested option. For those on a budget, the Hammock Gear Economy Burrow 20 offers excellent value, and the Kelty Cosmic 20 is a great women's option. With so many choices, you can find the perfect ultralight sleeping bag for your next outdoor adventure.
| Characteristics | Values |
|---|---|
| Warmest ultralight sleeping bag | Feathered Friends Swallow UL 20/30 Sleeping Bag |
| Temperature rating | 22 to 45 degrees Fahrenheit |
| Runner-up | Sea to Summit Spark Down Sleeping Bag |
| Best Budget Option | Hammock Gear Economy Burrow 20 |
| Weight | 27 ounces |
| Fill | 950-plus fill down |
| Fill weight | 16.8 ounces |
| Best for warmer weather | Western Mountaineering HighLite |
| Lightest model | Alpkit's PipeDream 200 |
| Weight | 545g |
| Fill | DownTek hydrophobic down |
| Comfort rating | 7°C |
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What You'll Learn
The importance of warmth-to-weight ratio
When it comes to choosing a sleeping bag, particularly for backpacking, it's essential to consider its two main characteristics: warmth and weight. The warmth-to-weight ratio is a critical factor in determining the right sleeping bag for your needs. This metric takes into account various factors, including down fill power, fill weight, shell material, shape, and dimensions.
The warmth-to-weight ratio is important because it allows you to maximise warmth while minimising weight. This is especially crucial for backpackers, as a sleeping bag will likely be one of the heavier and bulkier items in your pack. By selecting a bag with a favourable warmth-to-weight ratio, you can ensure that you stay warm without being weighed down. This is essential for a good night's sleep, as shivering through the night can quickly make your trip miserable.
Different types of insulation, such as down and synthetic fibres, play a significant role in the warmth-to-weight ratio. Down insulation is often preferred for its superior warmth-to-weight ratio. It is lighter, more compressible, and retains warmth better over time. However, synthetic insulation is more affordable, easier to work with, and still provides decent insulation when wet. Therefore, synthetic bags can be a better choice in certain situations, such as humid conditions where a down bag may not dry easily.
When comparing sleeping bags, it's important to look at their temperature ratings, which indicate the lowest temperature at which a bag will keep an "average sleeper" comfortable. To make an accurate comparison, you should consider bags with the same temperature rating and evaluate the warmth-to-weight ratio to find the most efficient option. Additionally, features like full-length zippers, draft collars, and tapered shapes can enhance thermal efficiency while maintaining lightweight construction.
In conclusion, the warmth-to-weight ratio is a critical factor in choosing a sleeping bag, especially for backpacking. It ensures you get the necessary warmth without sacrificing portability. By considering factors like insulation type, temperature rating, and design features, you can select a sleeping bag that optimises this ratio and enhances your outdoor experience.
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Goose down vs synthetic insulation
When shopping for a sleeping bag, one of the most important decisions you'll have to make is between down and synthetic insulation. The type of insulation directly affects the warmth, weight, water resistance, compressibility, price, and durability of sleeping bags.
Goose Down Insulation
Down is the plumage found underneath the exterior feathers on waterfowl such as ducks and geese. It consists of soft, fluffy, wispy filaments. Premium goose down can reach 900 fill power (or higher), while duck down can achieve fill-power ratings of no higher than 750 or 800. The higher the fill power, the better the warmth-to-weight ratio. This means that a sleeping bag with 900 fill power will be lighter than a sleeping bag with 600 fill power, assuming the fabrics and other features are comparable in weight.
Down is the lightest and most compressible option. Due to its natural lofting capabilities, a down sleeping bag can be compressed to a fraction of the size of a synthetic bag. This means that a down sleeping bag will take up less space in your pack, leaving more room for other hiking supplies.
However, down insulation has a tendency to clump up and lose loft when it gets wet, causing it to lose its insulation properties. It also takes a long time to dry and retains less warmth than synthetics when wet. Additionally, higher fill power gear is more expensive.
Synthetic Insulation
Synthetic insulation is typically made from polyester and comes in many forms and brand names. It is a more affordable option that is easier to work with. Synthetic batting doesn't need an intricate system of baffles to stay in place, and it retains a significant amount of insulative power when wet. It also dries faster than down.
However, synthetic fibres can't offer the same warmth-to-weight ratio as down. Synthetic insulation is also unable to pack down as small, and it is less durable than down. Synthetic insulation will not retain its loft over the years with many uses, and it may degrade over time, creating cold spots.
Both down and synthetic insulation have their pros and cons. Down insulation is ideal if you prioritise weight and compressibility, while synthetic insulation is a better choice if you expect your sleeping bag to get wet or if you are on a budget.
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Mummy-shaped bags for thermal efficiency
When it comes to thermal efficiency, mummy-shaped sleeping bags are a top choice. Their tapered design, narrowing from the shoulders to the feet, is specifically engineered to minimise excess space. This means there is less air inside the bag for your body to warm up, resulting in higher thermal efficiency. Mummy bags are also often equipped with a hood, providing additional warmth during chilly nights.
The snug fit of a mummy bag is its most notable advantage in cold weather conditions. By closely following the contours of your body, it traps body heat effectively. This makes mummy-shaped bags ideal for winter camping, high-altitude adventures, and sleeping in frigid environments. The reduced internal volume and the inclusion of a hood work together to significantly curb heat loss.
Compared to rectangular bags, mummy bags typically require less material and insulation. This streamlined design makes them lighter in weight and more compressible, which is advantageous when packing space is limited. Mummy bags excel in situations where pack weight and space are crucial considerations.
While rectangular bags offer more room for movement due to their uniform width, this extra space also means more air to heat, resulting in reduced thermal efficiency. Rectangular bags are better suited for milder weather conditions or indoor use, such as in cabins or RVs, where warmth is less of a priority.
When considering an ultralight sleeping bag, it's important to strike a balance between warmth and weight. Down insulation is a popular choice for mummy bags as it maximises the warmth-to-weight ratio, providing ample warmth without adding excessive weight to your backpack. Synthetic insulation, on the other hand, may be more affordable and moisture-resistant, but it falls short in terms of warmth-to-weight performance.
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Sleeping bag liners
Liners can be made from a variety of materials, including cotton, Tencel, fleece, silk, and synthetic fibres. Synthetic liners are a good option for humid conditions as they are moisture-wicking and breathable, while silk liners are light, compact, and designed for comfort, making them great for travel. If you're looking for a liner that adds warmth, insulated liners are a good option, with some claiming to add up to 25°F of warmth.
When choosing a sleeping bag liner, it's important to consider the temperature range you'll be using it in, as well as your comfort and budget. Liners can add warmth to your sleep system in colder conditions, but they can also help manage moisture in warm and humid weather.
In terms of specific products, the THERMOLITE Reactor Extreme liner is designed to add warmth in cold conditions, while the Sea to Summit Spark Down Sleeping Bag is a good option for ultralight sleeping bags. The Feathered Friends Swallow UL 20/30 Sleeping Bag is another ultralight option that has been reviewed as one of the warmest sleeping bags, keeping users warm in temperatures as low as 22 degrees Fahrenheit.
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Budget-friendly options
If you're looking for a budget-friendly sleeping bag that will keep you warm without breaking the bank, there are several excellent options available. Here are some top choices that offer a great balance between performance and cost:
Kelty Cosmic Down 20
The Kelty Cosmic Down 20 is an excellent choice for those seeking a budget-friendly option without compromising on quality. It has been recognised as the "Best Budget Down Sleeping Bag" by Switchback Travel. While it may not be the lightest option available, it offers a good balance between weight and warmth. The bag is made with a thicker shell fabric, using 20-denier nylon, which makes it more durable than many other bags in the same price range. Additionally, it includes premium features such as a stash pocket, draft collar, and draft tube, ensuring that you stay warm and comfortable during your outdoor adventures.
NEMO Disco 15
The NEMO Disco 15 is another outstanding option for budget-conscious adventurers. Recognised by CleverHiker as the "best bang for your buck," this sleeping bag combines an impressively low price with an innovative design. One of its standout features is the ample room it provides, making it ideal for side sleepers who tend to toss and turn during their sleep. The NEMO Disco 15 offers excellent value by delivering a comfortable and functional sleeping bag at a very reasonable price.
Enlightened Equipment Revelation Quilt 20
The Enlightened Equipment Revelation Quilt 20 stands out for its exceptional value and versatility. With its customizable design, high-quality materials, and excellent warmth-to-weight ratio, it has been recognised by CleverHiker as a close second to the NEMO Disco 15 in terms of value. This sleeping bag is ideal for backpackers seeking a lightweight and affordable option that doesn't sacrifice performance. Its versatility allows you to adjust to varying temperatures and conditions, making it a smart choice for budget-conscious adventurers.
Zpacks Classic 20
The Zpacks Classic 20 is another budget-friendly option that offers a minimalist and durable design. Recognised by CleverHiker for its ultralight construction, this sleeping bag provides exceptional warmth-to-weight performance. While it may not have all the bells and whistles of more expensive models, the Zpacks Classic 20 delivers a functional and warm sleeping solution at a very competitive price point.
Hammock Gear Economy Burrow 20
If you're looking for an extremely affordable option without compromising on performance, the Hammock Gear Economy Burrow 20 is an excellent choice. Tested by Outdoorgearlab in various locations, including Zion and Joshua Tree National Parks, this quilt-style sleeping bag kept testers warm on nights near freezing. While it may not be the lightest or the warmest, the Economy Burrow 20 offers unbeatable value for a quilt that is packed with features and functionality, all at a price that is significantly lower than many high-end models.
These budget-friendly options showcase that you don't have to spend a fortune to get a good night's sleep during your outdoor adventures. Each of these sleeping bags offers a unique combination of features, warmth, and weight, proving that you can find high-quality options without breaking the bank.
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Frequently asked questions
The Feathered Friends Swallow UL 20/30 Sleeping Bag is the warmest sleeping bag we tested, and at 27 ounces, it is light enough to qualify as a fastpacking sleeping bag.
The Western Mountaineering HighLite sleeping bag, the Therm-a-Rest Vesper 32 quilt, and the Feathered Friends Vireo UL are all known for being lightweight.
The Hammock Gear Economy Burrow 20 is a good option for a lightweight sleeping bag on a budget. It is much cheaper than some high-end models but still has many of the same features.
The PipeDream 200 is a good lightweight sleeping bag for hikers in the summer. It weighs just 545g and packs down to 15cm x 12cm.
Using a thermal sleeping bag liner, such as the Sea to Summit Reactor Liner, is the lightest and most effective way to boost the warmth of your sleeping bag.
