Best Mummy Sleeping Bags of 2025

We analyzed top picks from leading reviewers to find the best for every need
Published: July 25th, 2024

🏕️Picking the right mummy sleeping bag can make or break your sleeping experience on outdoor trips. Whether you're a seasoned backpacker, enjoy car camping, or are gearing up for a family outing, having a cozy sleeping bag is essential. We've done the legwork, researching and testing a slew of options to bring you the best mummy sleeping bags of 2024.

Here's our rundown to fit various needs and budgets.

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Overall Best: Therm-a-Rest Parsec 20

Therm-a-Rest Parsec 20F/-6C ​Ultralight Down Mummy Sleeping Bag Larch Regular

The Therm-a-Rest Parsec 20 stands out as our overall best pick due to its impeccable balance of warmth, weight, and comfort. Featuring 800-fill hydrophobic down insulation, this bag excels in keeping you warm and dry even in moist conditions. The small but thoughtful additions like the toe-box warmer and removable straps, which keep the bag secured to your sleeping pad, enhance its functionality. If you're heading into winter-ready backcountry excursions, the Parsec 20 proves its worth in varying conditions time and time again.

Lowest at any Popular Retailer
$469.95 at Amazon

More Answers

Still curious about the Therm-a-Rest Parsec 20 Sleeping Bag? Here are some answers you might find interesting:

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How warm is the Therm-a-Rest Parsec 20F/-6C sleeping bag?
If you're planning a camping trip in chilly conditions, the Therm-a-Rest Parsec 20F/-6C sleeping bag is worth considering. It's designed to keep you warm and cozy in cooler environments, thanks to some impressive features. The manufacturer highlights its use of [Nikwax Hydrophobic Down](https://www.shopsavvy.com/redirect?url=https%3A%2F%2Fwww.amazon.com%2Fs%3Fk%3Dnikwax%2Bhydrophobic%2Bdown%26tag%3Dssw.ans.tx-1-20), which is pretty cool because it doesn't soak up as much water and dries faster than regular down. This is handy if you find yourself in damp conditions, ensuring you stay warm even in unpredictable weather during multi-day trips. Our research points out that many people love the Parsec for its excellent warmth-to-weight ratio. It's got this neat zoned insulation that places the down where you need it most, keeping you warm without adding too much weight. With comfort and limit temperatures rated at 0°C and -6°C, it's great for three-season use. Just keep in mind it's not really for hardcore winter camping, so you might want to layer up if you're heading into extreme cold. According to our research, folks generally find the Parsec keeps them toasty, even when temperatures dip below freezing. It's noted for maintaining warmth when fully zipped up in harsh weather. Plus, it has some nice features like the [Toe-asis Foot Warmer](https://www.shopsavvy.com/redirect?url=https%3A%2F%2Fwww.amazon.com%2Fs%3Fk%3Dtoe-asis%2Bfoot%2Bwarmer%26tag%3Dssw.ans.tx-1-20), quilt and blanket loops, and [SynergyLink Connectors](https://www.shopsavvy.com/redirect?url=https%3A%2F%2Fwww.amazon.com%2Fs%3Fk%3Dsynergylink%2Bconnectors%26tag%3Dssw.ans.tx-1-20) to attach it to a sleeping pad, all of which add to its comfort and thermal efficiency. So, if you need a sleeping bag that's both warm and lightweight to carry around, the Therm-a-Rest Parsec 20F/-6C is a solid option. It's crafted with damp and cold conditions in mind, making it a great pick for three-season adventurers who want comfort without sacrificing performance.
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How much does the Therm-a-Rest Parsec 20F/-6C sleeping bag weigh?
The Therm-a-Rest Parsec 20F/-6C sleeping bag is pretty lightweight, coming in at around 1.68 pounds (or about 765 grams), according to the manufacturer's description. This makes it a good fit for those who like to pack light without giving up the warmth they need. In terms of temperature, the Parsec is rated for conditions around -6°C (21°F), which works well for cooler weather that's not quite freezing. It's filled with 800-fill Nikwax hydrophobic down, which helps it dry faster and repel moisture—a nice benefit if you're camping in damp areas. Some additional features include a Toe-asis Foot Warmer and a cinchable hood to keep you extra cozy, along with SynergyLink Connectors to attach it to a sleeping pad for better stability. If you're thinking about facing extremely cold conditions, you might need something more heavy-duty, like another model from Therm-a-Rest. But for most three-season outdoor adventures, this sleeping bag hits a sweet spot between weight and warmth.
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Is the Therm-a-Rest Parsec 20F/-6C sleeping bag good for backpacking?
The Therm-a-Rest Parsec 20F/-6C Ultralight Down Mummy Sleeping Bag seems like a solid option for backpacking. It's built for three-season use, so it'll cover you from early spring to late fall, which is handy for a variety of trips. One highlight is its 800-fill [Nikwax Hydrophobic Down](https://www.shopsavvy.com/redirect?url=https%3A%2F%2Fwww.amazon.com%2Fs%3Fk%3Dnikwax%2Bhydrophobic%2Bdown%26tag%3Dssw.ans.tx-1-20). The manufacturer says it absorbs way less water and dries quicker than untreated down, which is great if you're heading into damp areas. Just keep in mind, it's not meant to handle heavy rain on its own—you'd still need a tent or bivvy for that. From our research, people appreciate its warmth-to-weight ratio—it’s cozy without being bulky. It's rated to keep you comfortable around 0°C (32°F), which works well if you're planning on being out in colder, but not extreme, conditions. Feedback we found suggests folks are pretty happy using it in cooler weather. For instance, someone mentioned staying warm even when it got below freezing, and another was excited for future trips, which sounds like a thumbs up for its design and functionality. Overall, if you're after a sleeping bag that keeps you warm, isn't too heavy, and can handle a bit of moisture, the Parsec 20F/-6C might be just the ticket. Just be sure to pack extra rain protection if you’re expecting a downpour. Enjoy your backpacking adventures!
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Runner-up: Mountain Hardwear Phantom 0

Mountain Hardwear Phantom 0F/-18C Alpine Red Regular Left Zip

The Mountain Hardwear Phantom 0 is our runner-up for its remarkable performance and competitive pricing in the winter sleeping bag category. Boasting an 850-fill power down insulation, it offers exceptional warmth without adding bulk. This bag features a down collar and draft tube to minimize heat loss, and it comes with a generous compression sack for easy packing. According to our research, users appreciate its lightweight nature combined with the robust insulation, making it ideal for harsh winter conditions.

Lowest at any Popular Retailer
$799.99 at Amazon

More Answers

Still curious about the Mountain Hardwear Phantom Sleeping Bag? Here are some answers you might find interesting:

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Is the Mountain Hardwear Phantom 0F/-18C sleeping bag water-resistant?
Yep, the Mountain Hardwear Phantom 0F/-18C sleeping bag does have a water-resistant shell. This is great for keeping the down insulation dry, so you stay warm even if there's some moisture around. We found that the shell fabric does a pretty good job at water resistance, which is crucial when you're dealing with extreme cold in places like winter camping or alpine settings. Just a heads up—while the bag is lightweight and easy to pack, it may feel a bit tight for side sleepers. From our research, the fit seems more suitable for those who prioritize warmth over a roomy feel. So, if you prefer some extra space, you might want to consider this. Overall, the Phantom 0 does well in balancing warmth and portability. Just be cautious about the shell's durability if you're planning on hitting rough terrains.
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How much does the Mountain Hardwear Phantom 0F/-18C sleeping bag weigh?
Hey! So, if you're curious about the weight of the Mountain Hardwear Phantom 0F/-18C sleeping bag, I've got the details for you. According to the manufacturer's product description, this sleeping bag comes in at about 2 pounds and 15.9 ounces (that's roughly 1.36 kilograms) for the regular length version. This isn't the lightest bag out there, but when you consider it's designed to handle some seriously cold temps—down to 0F/-18C with a limit extending to -38F/-39C—it's actually impressively light for the kind of warmth it provides. That's mainly thanks to the 850-fill goose down, which is known for being both cozy and highly compressible. So, if warmth without too much bulk is what you're after, this one checks that box pretty well!
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How warm is the Mountain Hardwear Phantom 0F/-18C sleeping bag?
If you're planning a winter camping trip or heading to a high-altitude location, the Mountain Hardwear Phantom 0F/-18C sleeping bag should keep you pretty warm. The manufacturer says it's rated for temperatures down to 0 degrees Fahrenheit, so it’s meant for some serious cold. What's cool about it is the 850-fill power goose down insulation. This basically means you get a lot of warmth without carrying a heavy load. Our research shows folks generally like how lightweight and easy to pack the Phantom 0 is, which is handy when you're cramming gear into a backpack. Outdoor expert Michael Lanza even gave it a thumbs-up for its performance in freezing temps and noted how compact it gets once packed. The bag also comes with a durable nylon shell that's both breathable and water-resistant. This helps manage moisture, which can be a game-changer when the weather's all over the place. A couple of things to think about before buying: it has a mummy design, which some say feels snug. If you’re a side sleeper who likes some room to shift around, it might feel a bit cramped. Also, the Phantom 0 is on the pricier side. From what we've gathered, it's geared more towards hardcore adventurers who camp in really rough conditions and want reliable gear. So, if warmth and efficiency in frigid conditions are top of your list, the Mountain Hardwear Phantom 0F/-18C could be a solid choice. It's a thoughtful design for extreme adventures, although it's kind of an investment, especially if you’re venturing into the cold a lot.
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Budget Pick: Kelty Cosmic Down 20

For those looking to get the best bang for their buck, the Kelty Cosmic Down 20 is an excellent budget pick. This mummy bag doesn't skimp on quality, offering 800-fill power Dridown that ensures lightweight warmth and compactibility. It's especially well-suited for three-season backpacking, providing good performance at an affordable price. We found that users highly regard its value for money, making it a practical choice for budget-conscious adventurers.

Available at Amazon
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Best for Side-Sleepers: Big Agnes Sidewinder SL 20°

Side-sleepers rejoice with the Big Agnes Sidewinder SL 20°. This mummy bag is uniquely designed to accommodate the natural curves of your body, making it extremely comfortable for those who shift positions at night. It combines both down and synthetic fill to strike a balance between warmth and weight. This hybrid fill, along with its roomier cut, makes it perfect for backpacking trips that demand comfort. According to user feedback, the design stands out for providing extra space where it’s needed most, ensuring a restful sleep.

Available at Amazon
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Best for Cold Weather: Stone Glacier Chilkoot

When it comes to braving the elements, the Stone Glacier Chilkoot stands as the best option for cold weather camping. Rated down to 15°F, this bag is well-suited for winter conditions. Its soft material and pillowy draft collar add a layer of coziness, while the roomy hood is designed to enhance comfort, especially for side-sleepers. Though it is slightly heavier than some other models, the extra warmth it offers makes it a valuable choice for extreme conditions. However, note that it's only available in one size.

Available at Amazon
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Best for Families: Morrison Outdoors Little Mo 20

For families heading out on a camping trip, the Morrison Outdoors Little Mo 20 is a fantastic choice. Specifically designed for babies and toddlers, it features RDS-certified down fill that ensures your little ones stay warm. Lightweight and adhering to safe sleep practices, this bag helps parents rest easy knowing their children are snug and secure. Our research shows that it’s a top choice among families for its practicality and effectiveness in keeping kids cozy.

Available at Amazon
View at Amazon
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