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Hyke & Byke Eolus 0°F Cold Weather Mummy Hiking & Backpacking Sleeping Bag - Goose Down 800 FP 4 Season Sleeping Bags for Adults - Ultralight with Compression Stuff Sack

4.4 4.4 out of 5 stars 1,095 ratings

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Black/Clementine


About this item

  • Inner and outer nylon shell with vertical baffles that allow the adjustment of the 800 fill power insulation to move where the fill is needed the most.
  • 0 Degree Sleeping Bag - The Eolus mummy sleeping bag is packed with naturally hydrophobic and warmth-trapping Goose Down equal to 800 Fill Power. High loft, yet packs efficiently
  • Save Space & Shave Weight - This 4 Season winter sleeping bag is professionally designed for thru-hiking, backpacking and camping in temperatures down to zero degrees Fahrenheit. Ultralight for its class of bags, the Eolus cold weather sleeping bag boasts a superior warmth-to-weight ratio at only 3.1 lbs. (Regular Size)
  • Hydrophobic & Water-resistant - The 400T 20D ripstop nylon liner is coated with water repellant DWR, and the superior YKK zippers are also more water-resistant than typical zippers
  • Camping Sleeping Bags - Uses a differential cut and fill to get the most warmth-trapping down to the most important parts of the bag. Includes an internal storage pocket and a compression stuff sack that packs your Eolus compact sleeping bag down to just 12.5 inches long and 7.5 inches in diameter
  • Hyke & Byke Sleeping Bags - USA-based brand offers a collection of premium quality camping accessories and gear suitable for adults and children alike for all your adventures in the Great Outdoors

Additional Details

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From the brand


Product Description

A man standing in a Hyke & Byke sleeping bad on location in a northern climate.

Outdoor Gear That Eliminates Poverty

Hyke & Byke was founded on the principle of extending the wilderness to everyone through providing quality products, that we ourselves use, affordably. Ultralight backpacking, bouldering, peak bagging, and camping are hobbies, a mindset, and a way of life that we want to share with everyone.

Choose the Right Zero-Degree Sleeping Bag for You

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Eolus 0 F

Katahdin mummy-style 0 F sleeping bag for hiking and camping

Katahdin 0 F

Snowmass camping sleeping bag

Snowmass 0 F

Antero camping sleeping bag

Antero 0 F

Crestone camping sleeping bag

Crestone 0 F

Customer Reviews
4.4 out of 5 stars
1,095
4.5 out of 5 stars
928
4.5 out of 5 stars
816
4.5 out of 5 stars
192
4.6 out of 5 stars
98
Fill Power
800 FP 625 FP 650 FP 800 FP 650 FP
Fill Type
Hydrophobic 90/10 Goose Down Adv. Synthetic ClusterLoft Hydrophobic 80/20 Duck Down Hydrophobic 90/10 Goose Down Hydrophobic 80/20 Duck Down
Pack Weight
2.90 / 3.10 / 3.36 lbs. 3.27 / 3.54 / 3.91 lbs. 3.23 / 3.38 / 3.56 lbs. 3.45 / 3.71 lbs. 3.58 / 3.83 lbs.
Fabric Toughness
400T, 20D Ripstop Nylon 400T, 20D Ripstop Nylon 400T, 20D Ripstop Nylon 400T, 20D Ripstop Nylon 400T, 20D Ripstop Nylon
Shell Base
Adv. Synthetic ClusterLoft Adv. Synthetic ClusterLoft Adv. Synthetic ClusterLoft Adv. Synthetic ClusterLoft Adv. Synthetic ClusterLoft
Special Features
Ultralight for a 0 F mummy bag 100% Vegan Materials Warmest 4-season comfort Hammock-compatible Hammock-compatible
Comfort Temperature
30F / -1C 30F / -1C 30F / -1C 30F / -1C 30F / -1C
Comfort Limit
15F / -10C 15F / -10C 15F / -10C 15F / -10C 15F / -10C
Survival Limit
0F / -17C 0F / -17C 0F / -17C 0F / -17C 0F / -17C
Compressed Pack Size
7.5" x 12.5" 8" x 13.5" 8" x 13" 7" x 10" 8" x 11"
Man laying down in Eolus 0 F sleeping bag

Hike Farther and Stay Warmer

Utilize zipper baffles, hood/shoulder drawcords, and a DWR treated contoured bag design to customize a warm fit in tough climates.

Eolus 0 F sleeping bag with panel opened to show interior

Secured Internal Gear Pocket

Handy internal gear pocket with secure hook & loop closure to stash cell phone, mini flashlight, headphones, & other amenities.

YYK Anti-snag zipper

YKK Anti-Snag Zipper

YKK zippers are manufactured with high standards and thorough quality control processes. Zips tight and reduces snag during regular use.

Eolus 3-point compression bag

Included Compression Sack

Lightweight but tough 400T, 20D ripstop nylon. Compress your Eolus sleeping bag down to just 12.5" long and 7.5" in diameter.

Woman laying in tent inside an Eolus 0 F sleeping bag

Four Seasons & Down to Zero Degrees

Stay warm with premium hydrophobic goose down insulation and DWR-coated waterproof fabrics. How does it work? The microscopic air clusters found in down feathers creates "loft" that traps heat and keeps you warm for 4 season versatility.

Eolus 0 F Camping Sleeping Bags in 4 colorways

Ultra-Lightweight & Ultra Compact

The Eolus 0 F sleeping bag is our lightest-weight down bag, boasting 800 Fill Power while weighing just over 3 lbs. and compressing down to 12.5" long and 7.5" in diameter. The traditional 90/10 goose down is naturally hydrophobic and is sourced responsibly and ethically.

USA Based Company

Gear That Gives

Hyke & Byke LLC is committed to eliminating poverty to through Kiva sponsors and is a member of the Conservation Alliance. Designed for Adventure and Designed in the USA, our mission is to create honest, top-quality, and innovative gear for you to live your adventures.

Hyke & Byke tent with dramatic sunrise.

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Technical Details

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Customer reviews

4.4 out of 5 stars
4.4 out of 5
1,095 global ratings

Customers say

Customers like the warmth, quality and weight of the sleeping bag. For example, they mention it provides plenty of warmth, is well made and is light weight. Customers are also impresseded with the comfort and value, saying it's comfortable for 15F - 45F nights and a great investment in gear.

AI-generated from the text of customer reviews

197 customers mention158 positive39 negative

Customers like the warmth of the sleeping bag. They say it provides plenty of warmth, and can help in even colder temperatures. Some love the option to vent heat from the side in warm weather. Overall, most are satisfied with the warmth and comfort of the product.

"...The down stays where it should and the baffles inside do a great job keeping warm air in and cold air out...." Read more

"...Which is a royal PITA. I slept warm, cozy no problems with condensation or anything like that...." Read more

"...Ive had it in -10 to 90° F. Sleeping pad helps and base layers help in the cold. It has replaced my military bag completely...." Read more

"...I am definitely a cold-natured person, and this kept me toasty- I expect it will keep me comfortable in much cooler temps than I’ve tried it with yet..." Read more

159 customers mention139 positive20 negative

Customers like the quality of the sleeping bag. They say it's well-made, excellent, and can hold up to most conditions. Customers also like the stuff bag and the heavy duty strip sewn next to the zipper. Overall, customers recommend this bag.

"...The zipper didn't snag even once and is quite sturdy. All said, this bag is everything advertised and I feel it was a great investment in gear." Read more

"...Compacts down very nicely too with a great stuff-sack...." Read more

"...Back now from the backpacking trip, I can report that the bag served me well — but not perfectly...." Read more

"...Stays pretty stinkin warm. Ive had it in -10 to 90° F. Sleeping pad helps and base layers help in the cold...." Read more

126 customers mention121 positive5 negative

Customers are satisfied with the weight of the sleeping bag. They mention that it is light, compact, and perfect for thru-hiking. The material used is super light and strong. The bag is compacted down very nicely and fits in a small package.

"...It fit easily in my backpack and fluffs right up when removed from the stuff sack. I got inside to test it indoors and immediately started sweating...." Read more

"...Compacts down very nicely too with a great stuff-sack...." Read more

"...Overall, I'm pleased with the bag. It's super light, takes a bit of stuffing to get it back in the carrier, then the compression straps make short..." Read more

"...It is indeed lightweight which is an important consideration when backpacking...." Read more

107 customers mention99 positive8 negative

Customers like the comfort of the sleeping bag. They say that it is super comfy, incredibly warm, and fits nicely inside the Klymit. Customers also say that the bag is soft and feels well made. They mention that it has extra room at their feet and very roomy around the shoulders. Additionally, customers appreciate the fluffy and soft feel of the bag.

"...I am 5-11 and 195 pounds, average build. The regular length was a PERFECT FIT. At no point did I feel constrained in this bag...." Read more

"...The fit was good though my personal preference would be for a bag that’s a bit less snug...." Read more

"...Definitely suggest the XL. It gives me enough room to move around and not be bothered by the mummy design that i dont care for.Pros..." Read more

"...the large bag I had 6+ inches extra room at my feet and very roomy around the shoulders...." Read more

83 customers mention79 positive4 negative

Customers appreciate the value of the sleeping bag. They say it's a great investment in gear and affordable quality camping gear.

"...said, this bag is everything advertised and I feel it was a great investment in gear." Read more

"...I also liked that the price point was under $200 (April, 2023)...." Read more

"...Looks like a trash bag but well worth the money. She stays in the closet between events hung up. Stays pretty stinkin warm...." Read more

"...most compressible bag with the highest quality available that is honestly priced“." Read more

41 customers mention31 positive10 negative

Customers like the zipper of the sleeping bag. They say it's heavy duty, smooth, and easy to use. Some mention that the shoulder straps are fine when zipped up.

"...The zipper didn't snag even once and is quite sturdy. All said, this bag is everything advertised and I feel it was a great investment in gear." Read more

"...WarmPacks down super small. Fits in my eberle stock bag.Durable zipperCons..." Read more

"...Zippers are rugged, and I’ve had no issues with them catching fabric...." Read more

"...This zipper sticks a lot, and fit is tight if you’re bigger than 6 ft." Read more

22 customers mention11 positive11 negative

Customers are mixed about the smell of the sleeping bag. Some mention that it has no smell, while others say that it does have a new smell.

"...The down was loftily, it arrived without any odor or defects, and is sooo light!..." Read more

"...the bag did smelled a bit of goose feather but it was not too bad, I do hope the the smell goes away over time...." Read more

"...I think the old reviews must have been with the old zipper. 2. No smell. None at all. Not even polyester smell. 3...." Read more

"...After 5 days open the bag in the room, the smell reduced significantly. I am ok with thi. However, My wife complained a lot about the smell...." Read more

31 customers mention7 positive24 negative

Customers are dissatisfied with the size of the sleeping bag. They mention that it's a bit snug, small in width around the shoulders, and narrow for people with broad shoulders. Some say that the footbox is small, but that makes it much warmer at night. Some customers also mention that the bag is not roomy and that it was crazy huge inside the hammock.

"...This zipper sticks a lot, and fit is tight if you’re bigger than 6 ft." Read more

"Love it, great deal and very warm but very snug. The online measurements are actually bigger than my cheaper bag but this bag fits very tight on me" Read more

"...It was just crazy huge inside the hammock so maybe on the ground would be better. Overall: Zippers snag a bit on the extra fabric but always..." Read more

"...It has plenty of room for me to move my arms and legs when fully zipped and works when side sleeping as well, although the mummy head section is..." Read more

It Works Well, Snug as a Bug!
5 Stars
It Works Well, Snug as a Bug!
I studied sleeping bags for literally months before ordering this one. I was torn between versions that were $500-$700 for the lightest and warmest, but I simply couldn't find an excuse to warrant spending that much on a sleeping bag to shave a few ounces. Down to the wire before my camping trip in the autumn mountains this past weekend, I finally decided to order this and a quilt style to see which I liked better. This bag won hands down and I am returning the quilt.This bag packs small for the temperature rating and is relatively lightweight. It fit easily in my backpack and fluffs right up when removed from the stuff sack. I got inside to test it indoors and immediately started sweating. It has plenty of room for me to move my arms and legs when fully zipped and works when side sleeping as well, although the mummy head section is annoying when side sleeping.The best part is how warm I was at 15-20 degrees F. Sleeping bags are rated for survival - comfort level is about 20-degrees higher. I sleep cold and like warm blankets and found myself comfortable with just a base layer on in this bag. With a liner, it would be even warmer, but I don't want to backpack with that unless I really need it. I was terribly thankful for having this bag when everyone else was cold and filling their sleeping bags with hand warmers to stay warm!The down stays where it should and the baffles inside do a great job keeping warm air in and cold air out. The zipper didn't snag even once and is quite sturdy. All said, this bag is everything advertised and I feel it was a great investment in gear.
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Top reviews from the United States

Reviewed in the United States on November 9, 2021
Color: Black/ClementineSize: RegularVerified Purchase
Customer image
5.0 out of 5 stars It Works Well, Snug as a Bug!
Reviewed in the United States on November 9, 2021
I studied sleeping bags for literally months before ordering this one. I was torn between versions that were $500-$700 for the lightest and warmest, but I simply couldn't find an excuse to warrant spending that much on a sleeping bag to shave a few ounces. Down to the wire before my camping trip in the autumn mountains this past weekend, I finally decided to order this and a quilt style to see which I liked better. This bag won hands down and I am returning the quilt.

This bag packs small for the temperature rating and is relatively lightweight. It fit easily in my backpack and fluffs right up when removed from the stuff sack. I got inside to test it indoors and immediately started sweating. It has plenty of room for me to move my arms and legs when fully zipped and works when side sleeping as well, although the mummy head section is annoying when side sleeping.

The best part is how warm I was at 15-20 degrees F. Sleeping bags are rated for survival - comfort level is about 20-degrees higher. I sleep cold and like warm blankets and found myself comfortable with just a base layer on in this bag. With a liner, it would be even warmer, but I don't want to backpack with that unless I really need it. I was terribly thankful for having this bag when everyone else was cold and filling their sleeping bags with hand warmers to stay warm!

The down stays where it should and the baffles inside do a great job keeping warm air in and cold air out. The zipper didn't snag even once and is quite sturdy. All said, this bag is everything advertised and I feel it was a great investment in gear.
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23 people found this helpful
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Reviewed in the United States on October 9, 2020
Color: Black/ClementineSize: LongVerified Purchase
Customer image
5.0 out of 5 stars Great insulated bag that packs small
Reviewed in the United States on October 9, 2020
This is a good ass bag. Ive had it for a few years now and it shows as the hyke and bike is rubbing off. Looks like a trash bag but well worth the money. She stays in the closet between events hung up. Stays pretty stinkin warm. Ive had it in -10 to 90° F. Sleeping pad helps and base layers help in the cold. It has replaced my military bag completely. Im so use to lending my gear out that this does the same job in a much smaller package. I do pack a bivy to put it in and have not tested it out for being water proof and don't intend to if i can help it. Definitely suggest the XL. It gives me enough room to move around and not be bothered by the mummy design that i dont care for.
Pros
Warm
Packs down super small. Fits in my eberle stock bag.
Durable zipper
Cons
Sometimes insulation shifts and leaves thin spots for cold buns.
Sounds like a trashbag when you move around.

This is a nice bag, get a nice sleep pad to go with for no worries. Go XL and get a wide pad. Well worth it. Youll still be light and you can sleep at night.
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One person found this helpful
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Reviewed in the United States on October 15, 2017
Color: Black/ClementineSize: RegularVerified Purchase
9 people found this helpful
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Top reviews from other countries

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Brychan
5.0 out of 5 stars Brilliant!
Reviewed in the United Kingdom on June 6, 2023
Color: Black/ClementineSize: LongVerified Purchase
Manuel J. Vicente Montes (ceipso)
5.0 out of 5 stars Excelente saco de dormir a un precio razonable
Reviewed in Spain on July 18, 2020
Color: Black/ClementineSize: LongVerified Purchase
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Manuel J. Vicente Montes (ceipso)
5.0 out of 5 stars Excelente saco de dormir a un precio razonable
Reviewed in Spain on July 18, 2020
El saco de dormir Hyke & Byke Eolus 800 es una muy buena opción a elegir si deseamos un saco cálido en condiciones de bastante frío (Tª mínima de -17ºC), y cómodo. Las características del saco son de 100% 400 T Nylon y 520 g 90/10 de plumas de ganso. La talla larga sirve perfectamente para persona de 1,90 metros como yo, de hecho las medidas indicadas son de 230cm x 90 cm. El saco cuenta con cremallera YKK antienganches. Dentro del saco se puede encontrar un bolsillo para poder guardar un teléfono móvil o una linterna de pequeño tamaño. Yo compré una unidad a 199,97€ en mayo de 2020, que es un gran precio, pero aunque ahora que hago la reseña se encuentra a 227,27 €, el precio sigue siendo recomendable, aunque un poco menos, claro.

Su voto positivo me ayuda a realizar más reseñas. Gracias.
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36 people found this helpful
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BlackBeauty
5.0 out of 5 stars Perfekt
Reviewed in Germany on July 16, 2020
Color: Black/ClementineSize: LongVerified Purchase
Anton Kirschbauer
5.0 out of 5 stars sehr guter Schlafsack
Reviewed in Germany on January 5, 2020
Color: Blue/Lime GreenSize: RegularVerified Purchase
Cliente Amazon
5.0 out of 5 stars Ligereza y calor impresionante 👍👍
Reviewed in Spain on November 13, 2019
Color: Black/ClementineSize: RegularVerified Purchase
One person found this helpful
Report