Ashwin Lewis
When it comes to winter sleeping bags, it's essential to balance warmth and weight. While a thicker bag might provide more insulation, it can also be bulky and heavy, making it challenging to carry on backpacking trips. The key to a super-thin winter sleeping bag lies in its materials and design. Premium bags use high-fill-power down, often with a rating above 800, which provides a higher warmth-to-weight ratio. Additionally, features like draft tubes, draft collars, and hoods play a crucial role in sealing warmth inside the bag while allowing for ventilation when needed. Some bags also utilize ripstop reinforcements and water-resistant shells to provide peace of mind when sleeping outdoors. With thoughtful design and high-quality materials, winter sleeping bags can achieve a thin profile without compromising on warmth.
| Characteristics | Values |
|---|---|
| Temperature rating | 30°F is a good middle ground for all seasons. For winter camping, 0°F is a better starting point. |
| Weight | Ultralight sleeping bags are designed to minimize weight and maximize how far you can go. |
| Fill power | A higher fill power generally indicates better quality. 800-fill down or above is considered very high-quality. |
| Draft tube | A generous draft tube blocks cool air from entering through the zipper. |
| Draft collar | A draft collar around the neck and hood helps to seal in warmth. |
| Fit | Some bags provide more space, while others reduce dimensions to avoid cold spots. |
| Price | Sleeping bags can range from $50 to $1000. For car camping, $130 is a good budget, while backpacking bags can range from $150 to $500. |
| Breathability | A balance between breathability and water resistance is important. |
| Compressibility | Compressibility is an important feature for backpacking bags. |
| R-value | The R-value of your sleeping pad measures how well it insulates you from the ground. |
| Zipper | A two-sided half-length zipper can keep your face covered while providing ventilation for the rest of your body. |
| Materials | Goose down offers a higher warmth-to-weight ratio than duck down, but it is more expensive. |
| Durability | Look for high-quality materials and construction to ensure your sleeping bag is built to last. |
| Warranty | Some bags offer lifetime warranties, which can be an important consideration. |
| Intended use | Consider the conditions you typically backpack in. If you usually camp in warmer months, you may not need a winter-specific bag. |
| Additional features | Some bags have extra features like a hood, face gasket, or pad straps to keep your sleeping pad in place. |
| Brand | Popular brands include Mountain Hardwear, Feathered Friends, Western Mountaineering, and Kelty. |
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What You'll Learn
Mountain Hardwear's Phantom 0F
The Phantom 0F is an excellent choice for those seeking a warm and comfortable sleeping bag that won't weigh them down on their outdoor adventures. Its compressible design makes it ideal for streamlined expeditions and alpine-style pushes. The bag has been praised for its performance in wet and cold conditions, keeping users dry and warm even in heavy thunderstorms and single-digit temperatures.
One user review highlights the bag's warmth and packability, stating that it kept them warm even in temperatures 10 degrees below its EN comfort rating. The reviewer also mentions that they were able to fit a warm down jacket inside the bag without feeling too cramped, although comfort may vary depending on individual preferences and body types.
The Phantom 0F is a reliable choice for those seeking a lightweight and warm sleeping bag for their winter camping and mountaineering trips. It offers a competitive combination of price and warmth for its weight, making it a popular option for outdoor enthusiasts embarking on various expeditions.
Overall, Mountain Hardwear's Phantom 0F is a highly-regarded super-thin sleeping bag that delivers on warmth, comfort, and packability, making it a trusted companion for outdoor enthusiasts facing frigid mountain conditions.
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Feathered Friends' Snowbunting EX 0
The Feathered Friends Snowbunting EX 0 is a winter sleeping bag designed for mountaineers and backcountry skiers who spend nights in the mountains. It is insulated with 1 lb and 9 oz of 900+ fill power Responsible Down Standard Certified down, which is the highest quality of down produced. The bag has a high warmth-to-weight ratio and is lightweight and compressible, making it perfect for human-powered winter adventures. The Snowbunting EX 0 has a waterproof and breathable Pertex Shield EX shell, which can withstand occasional moisture and condensation. The shell is also slightly thicker at 15-denier, and the bag has 40-denier ripstop reinforcements, which are useful when sleeping beside climbing gear. The bag is extra roomy, allowing the sleeper to stash boot liners, gloves, and socks inside the bag to warm up and dry out overnight. This is a key feature for winter mountaineering or overnight ski touring. The Snowbunting EX 0 is available in regular and long lengths and weighs 2 lbs and 12 oz in the regular size. The bag is priced at $789 for the regular length.
The Snowbunting EX 0 has several well-thought-out features that make it a comfortable option for winter nights in the mountains. The continuous horizontal baffles enwrapping the bag prevent the down from migrating vertically and creating cold spots. The hood is well-insulated and adjustable, and the draft collar and draft tube along the zipper shut out drafts. The bag also has a cinchable hood and protective face gasket, which provide additional warmth. The Snowbunting EX 0 is the loftiest and puffiest bag in its category and has been described as the warmest product in its winter sleeping bag test.
The Feathered Friends Snowbunting EX 0 is a high-quality winter sleeping bag that offers excellent warmth and comfort for mountaineers and backcountry skiers. It has a number of well-designed features that make it a clever and well-featured bag for those spending time in the mountains during the winter.
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Western Mountaineering Puma Super MF
The Western Mountaineering Puma Super MF is a super-warm sleeping bag, ideal for winter camping and expeditions. It has a temperature rating of -25°F, making it suitable for extremely cold environments. The bag is designed to retain body warmth and provide a high warmth-to-weight ratio, thanks to its 850+ fill power goose down insulation. This amount of down fill is approximately 36 ounces, providing exceptional warmth.
The Puma Super MF features a MicroLite XP shell, which is a lightweight and breathable polyester microfiber. This material allows moisture to escape while keeping the sleeper warm and dry. The shell is highly durable and water-resistant, protecting the insulation from frost, condensation, and spindrift. It also offers excellent wind resistance, making it a great choice for windy and cold locations.
The sleeping bag has a nine-inch loft, which provides ample space for extra clothing layers if needed. The wider shoulder girth design allows for additional layering in extremely cold conditions. The bag also includes a down-filled collar and draft tubes to prevent drafts and heat escape. The draft tubes work in conjunction with the loft and down fill to create a warm and comfortable environment.
The Puma Super MF weighs less than 3.5 pounds, making it relatively lightweight for a winter sleeping bag. It compresses to a small size, similar to many three-season bags, making it convenient for backpacking and hiking trips. The bag's mummy hood design can be pulled tight around the face for additional warmth and protection from the elements.
Overall, the Western Mountaineering Puma Super MF is a high-quality, lightweight, and warm sleeping bag, ideal for winter camping, mountaineering, and cold-weather expeditions. Its excellent warmth-to-weight ratio, durable construction, and water-resistant shell make it a reliable choice for outdoor enthusiasts seeking comfort and protection in extremely cold conditions.
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Mountain Hardwear Bishop Pass 15
When it comes to winter sleeping bags, cold environments demand a warm and comfortable option. Mountain Hardwear's Bishop Pass 15 is a popular choice for those seeking a cost-effective solution without compromising on performance.
The Bishop Pass 15 stands out for its impressive warmth-to-weight ratio, especially considering its affordable price point. This is largely due to its generous fill weight, boasting 21 ounces of feathers—a feature typically found in more expensive models. While the fill power of 650 is not the highest, it still provides sufficient insulation for cold weather conditions. The bag's overall weight is influenced by the substantial amount of feathers, making it heavier than some other down-filled options but lighter than synthetic-filled alternatives.
In terms of comfort, the Mountain Hardwear Bishop Pass 15 offers a middle-ground solution. It provides approximately 62 inches of shoulder girth, making it roomy enough for side sleepers and those who tend to roll over frequently during the night. The softness of the down-filled insulation further enhances the comfort level, distinguishing it from the sometimes rigid feel of synthetic bags.
The design of the Bishop Pass 15 is simple yet functional. It features a long zipper, making it convenient to get in and out of the bag. The zipper also contributes to temperature regulation, allowing users to adjust ventilation as needed. Additionally, the interior of the bag is lined with bright fabric, making it easier to locate small items kept inside.
While the Mountain Hardwear Bishop Pass 15 may not offer the same performance as ultra-premium sleeping bags, it presents an excellent option for budget-conscious outdoor enthusiasts. It strikes a balance between warmth, weight, and comfort, making it a versatile choice for multisport activities. For backpackers seeking a lightweight and streamlined design, there may be more specialised options available. However, for those prioritising value for money without sacrificing performance, the Bishop Pass 15 is a worthy contender.
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Western Mountaineering UltraLite 20
Western Mountaineering, a company based in San Jose, California, has been manufacturing high-quality down sleeping bags since 1970. Their products are frequently the yardstick that all other sleeping bags are measured against. The Western Mountaineering UltraLite 20 is an award-winning, best-selling three-season sleeping bag. It features an ExtremeLite™ shell fabric, an efficient mummy shape, and 850+ fill power ethically sourced goose down. The UltraLite is perfect for any backcountry adventures, from the John Muir Trail to a weekend getaway.
The UltraLite is a lightweight, packable down sleeping bag that is made in the USA. It is available in three sizes, with weights ranging from 1.8 to 2 pounds, depending on the length. The bag has a slim fit, making it ideal for trimmer users, and its overall warmth-to-weight ratio is among the highest in its class. The UltraLite is filled with 17 ounces of 850+ fill power down, which provides more warmth than other 20°F models. This superior performance is partly due to the substantial draft collar, which can be cinched closed with an internal drawstring to seal heat inside the main compartment.
The UltraLite has a Comfort rating of 25°F and a Limit rating of 14°F, making it a great choice for spring and fall temperatures. For colder temperatures, you can layer by wearing extra insulation within the bag, provided that conditions aren't too extreme. The mummy shape of the bag also helps to conserve heat, and the full-length #5 YKK zipper provides a smooth, easy unzipping experience while saving weight. The bag's ExtremeLite fabric is also breathable, with a 12 denier ripstop nylon outer shell that makes the bag ultralight yet durable.
The Western Mountaineering UltraLite 20 is a fantastic choice for backpackers looking for a sleeping bag that can be used in colder three-season conditions. While the bag is on the expensive side, with a price range of \$600-\$635, its durability and versatility make it a worthwhile investment for serious backcountry travelers.
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Frequently asked questions
Some super thin winter sleeping bags include the Feathered Friends Egret YF 20, the Mountain Hardwear Phantom 0F, and the Feathered Friends Snowbunting EX 0.
When looking for a thin winter sleeping bag, it is important to consider the fill power and fill weight. A higher fill power generally indicates a higher quality down. Additionally, look for features that preserve warmth, such as a draft tube, draft collar, and a hood.
Thin winter sleeping bags are lightweight and highly packable, making them ideal for backpacking and camping trips. They provide warmth and comfort without adding bulk or weight to your gear.
Thin winter sleeping bags can be purchased from various outdoor gear retailers, such as REI, Backcountry.com, or Garage Grown Gear. You can also find them on online marketplaces like Amazon or directly from the manufacturer's website.
