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Hyke & Byke Katahdin 0°F Cold Weather Mummy Hiking & Backpacking Sleeping Bag - Synthetic 625 FP 4 Season Sleeping Bags for Adults - Ultralight Includes Compression Stuff Sack

4.5 4.5 out of 5 stars 928 ratings

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About this item

  • Nylon
  • 0 Degree Sleeping Bag - The Katahdin mummy sleeping bag uses our Advanced ClusterLoft synthetic fibers instead of traditional down. 100% vegan, this 625 Fill Power synthetic tests warmer than premium 600 FP goose down. 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 Katahdin cold weather sleeping bag boasts a superior warmth-to-weight ratio at only 3.54 lbs. (Regular Size)
  • Hydrophobic & Water-resistant - The 400T 20D ripstop nylon liner is coated with water repellant DWR, and synthetic fill like ClusterLoft will always outperform traditional down in wet environments. The superior YKK zippers are also more water-resistant than typical zippers
  • Camping Sleeping Bags - Recommended for newer backpackers who want maximum versatility on a budget. Includes an internal storage pocket and a compression stuff sack that packs your Katahdin compact sleeping bag down to just 11 inches long and 8 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.

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Customer Reviews
4.5 out of 5 stars
928
4.4 out of 5 stars
1,094
4.5 out of 5 stars
816
4.5 out of 5 stars
192
4.6 out of 5 stars
98
Fill Power
625 FP 800 FP 650 FP 800 FP 650 FP
Fill Type
Adv. Synthetic ClusterLoft Hydrophobic 90/10 Goose Down Hydrophobic 80/20 Duck Down Hydrophobic 90/10 Goose Down Hydrophobic 80/20 Duck Down
Pack Weight
3.27 / 3.54 / 3.91 lbs. 2.90 / 3.10 / 3.36 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
100% Vegan Materials Ultralight for a 0 F mummy bag 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
8" x 13.5" 7.5" x 12.5" 8" x 13" 7" x 10" 8" x 11"
Hyke & Byke branding on a Katahdin camping sleeping bag. 625 fill power using synthetic ClusterLoft

625 FP Advanced Synthetic

Tests warmer than premium 600 FP Goose Down. High loft, yet packs efficiently. Water-resistant & breathable. Lightweight & durable.

Internal gear pocket

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.

3-point compression sack for camping sleeping bags

Included Compression Sack

Lightweight but tough 400T, 20D ripstop nylon. Compress your Katahdin sleeping bag down to just 11" long and 8" in diameter.

Hyke & Byke Synthetic Mummy Sleeping Bag

Down-like Warmth and Performance from a Synthetic

Typical synthetic insulation tests to be 300-400 FP (Fill Power), while our innovative ClusterLoft Advanced Synthetic tests to have a loft equivalent to 625 FP. This is a higher fill power than even many down sleeping bags on the market.

Hyke & Byke Katahdin Synthetic Sleeping Bags

Ultra-Lightweight & Ultra Compact

Our ClusterLoft Advanced Synthetic insulation boasts a higher warmth-to-weight ratio than most other synthetic sleeping bags. And, because it's a synthetic, it's both more compressible and durable than down, giving you a high-end sleeping bag that is incredibly versatile.

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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Customer reviews

4.5 out of 5 stars
4.5 out of 5
928 global ratings

Customers say

Customers like the insulation, quality and portability of the sleeping bag. For example, they mention it's comfortable, light and easy to pack. Customers are also impresseded with the performance. That said, opinions are mixed on the size and ease of packing.

AI-generated from the text of customer reviews

93 customers mention69 positive24 negative

Customers like the insulation of the sleeping bag. For example, they mention it keeps them warm, it's comfortable at 25 degrees F, and the shoulder cinch made a huge temp difference. That said, some say it'll handle 25-degree weather no problem.

"...opening around face and also above shoulder - the should cinch was a HUGE temp difference and saved me from my normal cold to really being very cold..." Read more

"Very happy with performance. Was comfortably warm at 25 degrees F. Plenty of room for my 5' 9" 200 lb frame...." Read more

"...He said it was warm and comfortable but that he didn't think it would be something he could use this winter as the temp only got down into the 40s..." Read more

"Does not keep your feet warm even with thick sock on." Read more

65 customers mention54 positive11 negative

Customers like the quality of the sleeping bag. They say it looks well made, is amazing, and is made of very tough material. Some mention that it maintains its form and has excellent loft.

"...- but with that said, the material that it is made out of is very tough - super light - zero degree bag and I saw sub freeze temps at 12,000+ feet,..." Read more

"...Not a deal breaker. Excellent loft, and no cold spots." Read more

"...This is a very well made sleeping bag! It appears to be long enough too for the recipient who is 6’6”!!" Read more

"These are great sleeping bags. They are super warm, and well made...." Read more

49 customers mention46 positive3 negative

Customers are satisfied with the portability of the sleeping bag. They mention that it is a great light weight bag, it packs down small, and it fits neatly into the sleeping bags compartment of their packs. Customers also appreciate the big size and warmth.

"...with that said, the material that it is made out of is very tough - super light - zero degree bag and I saw sub freeze temps at 12,000+ feet, I was..." Read more

"...I also took off my beanie. They compressed well and were light weight to carry in on a back pack camp out...." Read more

"...He took it on a trial run up north and said he was impressed with how lightweight it was...." Read more

"...It fit neatly into the sleeping bag compartment of my 65L pack so I'm happy with the size. Didn't measure the weight, but it won't bog you down...." Read more

35 customers mention31 positive4 negative

Customers like the comfort of the sleeping bag. For example, they say it's soft, warm, and cozy. Some mention that it has a premium feel to it, and that the fabric is slick on the inside making it easier to roll over.

"...He said it was warm and comfortable but that he didn't think it would be something he could use this winter as the temp only got down into the 40s..." Read more

"...He reported he was warm and comfortable. He was only wearing thin hiking pants and a very thin long sleeve top that was more for sun protection...." Read more

"The bag itself is well made and has a premium feel to it. On the other hand the fill within the bag seems to be low and has many cold spots in it...." Read more

"...I picked the Hyke&Byke as a go to winter bag to help give me a comfortable sleep and help keep me warm in below 30 degrees nights while in the..." Read more

25 customers mention25 positive0 negative

Customers appreciate the value of the sleeping bag. They say it's good value for the money and a good quality.

"...It is a great bag for a great price." Read more

"...I'd say it's a pretty good value for the money if you're doing 3/4 season camping...." Read more

"...Great bargain if you’re looking for a winter bag. in the picture is next to a klymit bag that is known to be a little short but still an adult bag...." Read more

"...Seems like a great bag for the cost, real value...." Read more

23 customers mention19 positive4 negative

Customers like the performance of the sleeping bag. They mention that it works well, is easy to pack, and maintains its form. Some say that it's better than expected and worked great all through the winter.

"Very happy with performance. Was comfortably warm at 25 degrees F. Plenty of room for my 5' 9" 200 lb frame...." Read more

"excellent" Read more

"...It was 30 degrees with snow on the ground. This sleeping bag performed very well...." Read more

"...But, so far, it seems to be doing very well. I cannot say one way or another as to the effectiveness of this product in 0ºF temperatures or lower...." Read more

17 customers mention7 positive10 negative

Customers are mixed about the size of the sleeping bag. Some mention that the regular size fit them fine, it bungees on to their backpack very snug, and has room to move around. However, others say that it's not as small or compact as they thought it would be after reading the description. It's a little bigger than they expected, and the sizing seems off.

"...this bag is not the lightest weight and not the most compact in size. but the cost per value is the big plus...." Read more

"...and saved me from my normal cold to really being very cold - fit well I’m my pack with its compression bag" Read more

"...It’s not as small or compact as I thought it would be after reading the description and looking at the pics...but the quality is great" Read more

"...I ordered us the regular size as well. I fit comfortably in the bag and have room to move around...." Read more

13 customers mention5 positive8 negative

Customers are mixed about the ease of packing. Some mention that it's light and easy to pack, while others say that it is a bit tricky to pack back up. Some say that the bag is not super compressible and is able to be rolled up.

"this product was a little difficult to get back in sack but over all what i spent was reasonable for the warmth and comfort i camped in 25 degrees..." Read more

"...We both stayed dry. These bags are relatively easy to return to their carry bag; I recommend stuffing it in, not rolling...." Read more

"...It is a bit tricky to pack back up, but all good light weight sleeping bags take time ;)..." Read more

"Soft, well made bag, only problem is it is hard to get back in the bag....used in really cold weather!" Read more

Great beginner bags
4 Stars
Great beginner bags
I purchase 3 of this bags for a winter Hut to Hut 3 days snowshoeing with my kids and wife. this bag is not the lightest weight and not the most compact in size. but the cost per value is the big plus. If the person are looking for the lightest and compact, this is not the bag! these bags can be cost over $300 or lot moreThe weight is about 3.6lb+, we mount the bag on the exterior of the backpack. because if you put the bag inside, you will have no room for other stuffs.The temperature inside the hut is about 30F but not freezing, however is constantly cold. this bag with a bag liner keep my kids and wife warm. We did not use them outdoor and below 30F.
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