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Details

  • Backpacker magazine conducts rigorous field testing to select award winners in recognition of their innovation in design, materials and performance
  • Proprietary welded Lamina construction enhances loft and eliminates cold spots; zoned insulation maximizes warmth where it's needed most
  • Thermal.Q insulation has outstanding compressibility and maintains excellent loft and warmth, even when damp
  • Performance mummy cut is snug, reducing girth, weight and bulk while maximizing thermal efficiency
  • Comfort footbox follows natural foot position for maximum warmth and comfort
  • Face gasket and tailored hood comfortably block drafts at the hood opening and seal in warmth
  • Single #5 half-length center zip with dual sliders minimizes weight and allows for ventilation
  • Ultralight shell is soft and highly wind-resistant
  • Silnylon compression stuff sack and mesh storage sack included

Imported.

View all Mountain Hardwear Men's Sleeping Bags

REI membership

Specs

Best Use Backpacking
EN Lower Limit 32 degrees Fahrenheit
EN Comfort 41 degrees Fahrenheit
Temperature Rating (F) 32 degrees Fahrenheit
Temperature Rating (C) 0 degrees Celsius
Weight
Long Left
1 lb. 12 oz.
Regular Left
1 lb. 10 oz.
Shell Tactel nylon
Zipper Location Front
Insulation Type Synthetic
Fill Thermal.Q synthetic fibers
Fill Weight
Long Left
1 lb. 0.4 oz.
Regular Left
1 lb. 0.1 oz.
Lining 20-denier taffeta
Sleeping Bag Shape Mummy
Fits Up To (in.)
Long Left
78 inches
Regular Left
72 inches
Shoulder Girth (in.)
Long Left
66 inches
Regular Left
63 inches
Hip Girth (in.)
Long Left
64 inches
Regular Left
58 inches
Stuff Sack Size 6 x 12 inches
Stuff Sack Volume 5.6 liters
Compressed Volume Unavailable
Gender Unisex
Rated 3 out of 5 by from Love it and Hate it I love that this is a super warm bag and the lightest in all the synthetics I have found. I love how light and packable this bag is. The front zipper was a little strange to get used to but a rather great feature for side sleepers. There is only one deal breaker for me and is the reason why I am returning it... The zipper only goes down to the torso and no zipper at the foot box which means if you get hot and need to stick your feet out you have to literally climb half out of the bag. The next lightest bag, in a synthetic, with a similar temp rating, is a full pound heavier. I marked Yes for recommending the product but only if you don't mind the confinement.
Date published: 2016-05-25
Rated 4 out of 5 by from Warm, Comfortable and Light Just returned from the Gila Wilderness in New Mexico and the Spark Sleeping Bag performed admirably. Night time temps dipped into the low 30's the first two nights. With a light base layer, I stayed warm with no cold spots. The generous hood was easy to pull tight. Temps warmed to the mid-40's as the trip continued, and the half zipper opening allowed for plenty of ventilation. Getting in and out of the bag was a little more cumbersome than a full zippered bag, but not really an issue. The zipper did snag on occasion. For the weight and warmth, this is an excellent Summer bag.
Date published: 2016-05-09
Rated 5 out of 5 by from best synthetic bag I've ever used Picked this up just in time for a short expedition into Snow Mountain Wilderness, and this bag performed amazingly well. Even though it's only rated to 32, I was warm enough to where I had to unzip my puffy at just below freezing, and with an added reflective bivy bag around it this bag saved my butt when we got caught in a snowstorm and the temperature plummeted. The fact that it's lighter and more packable than any synthetic I've ever used is just gravy. It's now my precious.
Date published: 2015-03-25
Rated 5 out of 5 by from Love this bag so far! As weather is a fickle thing, I woke up the morning after my second night sleeping in this bag to find the temperature had dropped to 19 degrees F. I slept wearing a warm baselayer and warm tights and was comfortable enough that I had no idea it was that much below freezing. It's a really sweet bag for those of us who pack light but refuse to use animal products.
Date published: 2016-04-15
Rated 5 out of 5 by from Incredibly compact and light weight I bought this to use as a summer mountaineering bag to go in my ultra-light kit. I wanted to go with synthetic for those situations where foul weather leaves you looking like a drowned rat by the time you get your bivy / tent set up. I also have a single wall tent so water getting on the bag from condensation was a concern, hence I was wary of using down. This bag comes with a compression sack, which when used will make it crazy compact. I think it has to be the most compact bag (down or synthetic) I have ever seen for this temp range. Also incredibly light as you can see from its specs. So far I have taken this on an overnight trip where we camped just below the summit of Eldorado Peak in the North Cascades. Temps that night were in the mid 30's, and I woke up sweating. This thing will keep you pretty toasty in the temp range it specifies. I think if you wanted to wear a puff or fleece layer you could use the bag in much colder temps. Got some water on it from condensation near the bottom of my tent walls, and couldn't tell any difference in comfort. This is a nice change from having to worry about it as I do with my down bag (I do love my down bag for really cold freezing weather). Its a minimalist light weight bag, so doesn't have a fancy draft collar and the zipper only goes part way down the bag. I see all these as positives, and if you are using it for its intended purpose, you will too. I am 5'-10" but bought the long because I sleep with my arm above my head and like to tuck it into the hood. As mummy bags go, it rates pretty well in terms of not being too constricting. All around very comfy.
Date published: 2015-08-26
Rated 5 out of 5 by from performed perfectly I bought this about a year ago and I finally got to test it out this weekend on a two night trip. first of all let me just say that this bag is definitely worth every cent. I'm 5'11" 200 lbs and it fits me perfectly. I was a little concerned with the temp however when the Temps got down to 34 it was still plenty warm. I can't wait to test this bag to its true limits because I believe it can go a lot further than its rated for. the only thing that I wish about this bag was that the zipper was about 2" longer, it's a little hard getting out in my tent. I would highly recommend this to anyone
Date published: 2017-02-21
Rated 5 out of 5 by from Works in Iceland and Hawaii I got this bag because of it's small size and it's heat retention when I was traveling through Iceland. The bag kept up to Iceland fall/winter conditions slight above 30F and I love that it comes with a compression bag and a regular bag. This bag has also seen some duty in 60-70 degree camping in hawaii although I only used it as a blanket there because it traps heat too well
Date published: 2016-02-22
Rated 5 out of 5 by from Nectar! Great bag. Wind resistant and roomier than expected. I am 6ft but opted to get the long to add room in the foot box and am happy I did. 2 extra ounces equals lots more comfort.
Date published: 2015-08-13
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So what degree bag is this considered - a 32 degree bag?

Asked by: Guardian Angel
Yes, this is the rating for a man. The bag would be rated at 41º for women. See our Expert Advice on EN ratings: http://www.rei.com/learn/expert-advice/sleeping-bag-backpacking.html
Answered by: REIservice
Date published: 2017-05-16

Is the bottom insulated or is it dependant on an insulated sleeping pad?

Asked by: hikertrash98
The HyperLamina Spark has the Thermal.Q synthetic fibers on the bottom of the bag.
Answered by: REIservice
Date published: 2017-05-16

How does this bag perform in wet conditions, say in Olympic National Park in October?

Asked by: J-S-P
The synthetic insulation in this bag allows it to perform well even in wet conditions.
Answered by: REIservice
Date published: 2017-05-16

How do you pack this sleeping bag? It did not arrive with a small bag for packing. It arrived with a netted bag that doesn't compress its size for backpacking.

Asked by: Andrea
A stuff sack is included with this sleeping bag.
Answered by: REIservice
Date published: 2017-06-13

how is the 20 denier shell holding up on this bag? it is my one concern.

Asked by: iceaxed
When using ultra-lightweight gear it is important to exercise increased mindfulness in how you are using the product and how the surroundings might affect it. That being said, we have not heard any feedback in specific in regards to the shell on the HyperLamina Spark having durability problems.
Answered by: REIservice
Date published: 2017-05-16

Does this bag have sleeping pad straps to hold it in place? 

Asked by: iceaxed
The HyperLamina Spark Sleeping Bag does not have loops to attach a sleeping pad.
Answered by: REIservice
Date published: 2017-05-16

Is the specified weight accurate?  Some commenters say other M.H. products are slightly heavier than advertised.  

Asked by: iceaxed
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Back to top

Please select a color/size.

Reviews

Rated 3 out of 5 by from Love it and Hate it I love that this is a super warm bag and the lightest in all the synthetics I have found. I love how light and packable this bag is. The front zipper was a little strange to get used to but a rather great feature for side sleepers. There is only one deal breaker for me and is the reason why I am returning it... The zipper only goes down to the torso and no zipper at the foot box which means if you get hot and need to stick your feet out you have to literally climb half out of the bag. The next lightest bag, in a synthetic, with a similar temp rating, is a full pound heavier. I marked Yes for recommending the product but only if you don't mind the confinement.
Date published: 2016-05-25
Rated 4 out of 5 by from Warm, Comfortable and Light Just returned from the Gila Wilderness in New Mexico and the Spark Sleeping Bag performed admirably. Night time temps dipped into the low 30's the first two nights. With a light base layer, I stayed warm with no cold spots. The generous hood was easy to pull tight. Temps warmed to the mid-40's as the trip continued, and the half zipper opening allowed for plenty of ventilation. Getting in and out of the bag was a little more cumbersome than a full zippered bag, but not really an issue. The zipper did snag on occasion. For the weight and warmth, this is an excellent Summer bag.
Date published: 2016-05-09
Rated 5 out of 5 by from best synthetic bag I've ever used Picked this up just in time for a short expedition into Snow Mountain Wilderness, and this bag performed amazingly well. Even though it's only rated to 32, I was warm enough to where I had to unzip my puffy at just below freezing, and with an added reflective bivy bag around it this bag saved my butt when we got caught in a snowstorm and the temperature plummeted. The fact that it's lighter and more packable than any synthetic I've ever used is just gravy. It's now my precious.
Date published: 2015-03-25
Rated 5 out of 5 by from Love this bag so far! As weather is a fickle thing, I woke up the morning after my second night sleeping in this bag to find the temperature had dropped to 19 degrees F. I slept wearing a warm baselayer and warm tights and was comfortable enough that I had no idea it was that much below freezing. It's a really sweet bag for those of us who pack light but refuse to use animal products.
Date published: 2016-04-15
Rated 5 out of 5 by from Incredibly compact and light weight I bought this to use as a summer mountaineering bag to go in my ultra-light kit. I wanted to go with synthetic for those situations where foul weather leaves you looking like a drowned rat by the time you get your bivy / tent set up. I also have a single wall tent so water getting on the bag from condensation was a concern, hence I was wary of using down. This bag comes with a compression sack, which when used will make it crazy compact. I think it has to be the most compact bag (down or synthetic) I have ever seen for this temp range. Also incredibly light as you can see from its specs. So far I have taken this on an overnight trip where we camped just below the summit of Eldorado Peak in the North Cascades. Temps that night were in the mid 30's, and I woke up sweating. This thing will keep you pretty toasty in the temp range it specifies. I think if you wanted to wear a puff or fleece layer you could use the bag in much colder temps. Got some water on it from condensation near the bottom of my tent walls, and couldn't tell any difference in comfort. This is a nice change from having to worry about it as I do with my down bag (I do love my down bag for really cold freezing weather). Its a minimalist light weight bag, so doesn't have a fancy draft collar and the zipper only goes part way down the bag. I see all these as positives, and if you are using it for its intended purpose, you will too. I am 5'-10" but bought the long because I sleep with my arm above my head and like to tuck it into the hood. As mummy bags go, it rates pretty well in terms of not being too constricting. All around very comfy.
Date published: 2015-08-26
Rated 5 out of 5 by from performed perfectly I bought this about a year ago and I finally got to test it out this weekend on a two night trip. first of all let me just say that this bag is definitely worth every cent. I'm 5'11" 200 lbs and it fits me perfectly. I was a little concerned with the temp however when the Temps got down to 34 it was still plenty warm. I can't wait to test this bag to its true limits because I believe it can go a lot further than its rated for. the only thing that I wish about this bag was that the zipper was about 2" longer, it's a little hard getting out in my tent. I would highly recommend this to anyone
Date published: 2017-02-21
Rated 5 out of 5 by from Works in Iceland and Hawaii I got this bag because of it's small size and it's heat retention when I was traveling through Iceland. The bag kept up to Iceland fall/winter conditions slight above 30F and I love that it comes with a compression bag and a regular bag. This bag has also seen some duty in 60-70 degree camping in hawaii although I only used it as a blanket there because it traps heat too well
Date published: 2016-02-22
Rated 5 out of 5 by from Nectar! Great bag. Wind resistant and roomier than expected. I am 6ft but opted to get the long to add room in the foot box and am happy I did. 2 extra ounces equals lots more comfort.
Date published: 2015-08-13
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Questions & Answers

So what degree bag is this considered - a 32 degree bag?

Asked by: Guardian Angel
Yes, this is the rating for a man. The bag would be rated at 41º for women. See our Expert Advice on EN ratings: http://www.rei.com/learn/expert-advice/sleeping-bag-backpacking.html
Answered by: REIservice
Date published: 2017-05-16

Is the bottom insulated or is it dependant on an insulated sleeping pad?

Asked by: hikertrash98
The HyperLamina Spark has the Thermal.Q synthetic fibers on the bottom of the bag.
Answered by: REIservice
Date published: 2017-05-16

How does this bag perform in wet conditions, say in Olympic National Park in October?

Asked by: J-S-P
The synthetic insulation in this bag allows it to perform well even in wet conditions.
Answered by: REIservice
Date published: 2017-05-16

How do you pack this sleeping bag? It did not arrive with a small bag for packing. It arrived with a netted bag that doesn't compress its size for backpacking.

Asked by: Andrea
A stuff sack is included with this sleeping bag.
Answered by: REIservice
Date published: 2017-06-13

how is the 20 denier shell holding up on this bag? it is my one concern.

Asked by: iceaxed
When using ultra-lightweight gear it is important to exercise increased mindfulness in how you are using the product and how the surroundings might affect it. That being said, we have not heard any feedback in specific in regards to the shell on the HyperLamina Spark having durability problems.
Answered by: REIservice
Date published: 2017-05-16

Does this bag have sleeping pad straps to hold it in place? 

Asked by: iceaxed
The HyperLamina Spark Sleeping Bag does not have loops to attach a sleeping pad.
Answered by: REIservice
Date published: 2017-05-16

Is the specified weight accurate?  Some commenters say other M.H. products are slightly heavier than advertised.  

Asked by: iceaxed
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