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Last updated January 1st, 2020
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The Sea to Summit Spark SP0i 40F Sleeping Bag is an ultralight sleeping bag for warm weather adventures. The spark series uses Responsible Down Standard (RDS) certified ULTRA-DRY 850+Loft premium goose down. The ULTRA-DRY water-repellent treatment virtually eliminates the negative effect moisture has on down. So, even if you hiked through a rain-storm your sleeping bag should still keep you warm and cozy. This 40 degree, mummy-style bag will be a comfortable option between 40 and 60 degrees Fahrenheit. This bag could also be used as a sleeping bag liner as well as a sleeping bag on its own. This sleeping bag stuffs down to about the size of your Camelbak water bottle for easy packing. Plus, the zipper on this bag is incredibly light and gram-saving for all you ultra-light hikers out there.
FEATURES of the Sea to Summit Spark SP0I 40F Sleeping Bag
ULTRA-DRY Down 850+ Loft 90% Down Cluster Premium Goose Down certified Responsible Down Standard (RDS)
10D shell and 7D liner materials help to achieve the incredible lightweight and compact packed size
Includes lightweight Ultra-Sil™ compression bag and storage cell
1/3 zipper-length - trimmed for gram-saving performance
Sewn-through baffle construction
Product Specifications
Sustainability:
Responsible Down Standard
Fill Weight (Regular):
6.3 oz
Fill Weight (Long):
7.2 oz
Max User Height (Long):
76 in.
Foot Circumference (Regular):
35 in.
Foot Circumference (Long):
38 in.
Shoulder Circumference (Regular):
58 in.
Hip Circumference (Regular):
50 in.
Shoulder Circumference (Long):
60 in.
Hip Circumference (Long):
52 in.
Certification(s):
Responsible Down Standard
Ultralight:
Yes
Weight (Regular):
12 oz
Weight (Long):
14 oz
Disclaimer:
We only ship this brand to US Addresses.
Gender:
Mens
Best Use:
Backpacking
Insulation:
Down
Temperature Rating:
31 - 40 Degrees Fahrenheit
Exact Temperature Rating:
40 Degrees Fahrenheit
Sleeping Bag Shape:
Mummy
Max User Height (Regular):
72 in.
Fill Details:
850+ Loft ULTRA-DRY Down
Zipper Side:
Left
Responsible Down Standard
The Responsible Down Standard helps make sure the down and feathers used in your products are only taken from humanely treated animals. Consumers purchasing products with this certification can be ensured the ducks and geese are not subjected to unnecessary harm.
Rated 1 out of
5 by
daniel g. from
satisfied but disappointed[This review was collected as part of a promotion.] This bag is everything I had wished. However, I am very disappointed by the ridiculously small stuff sack that comes with it. I have tried to put the bag in the sack 6 times. It will NOT fit in the bag that came with it. I now have to spend $$$ to buy a stuff sack the bag can be put in. Really. This is a common issue with products sold by Sea to Summit. The stuff sack are TOO small
Date published: 2023-05-25
Rated 4 out of
5 by
Ronald R. from
Bag fit is expected for[This review was collected as part of a promotion.] Bag fit is expected for a tall (I'm 6', 205 lbs). Plenty of room to sleep on my back or side. Weight is great - sub 2 lbs. Warmth is really close to stated. I was a bit chilly @35F, but I sleep cold.
Date published: 2023-04-21
Rated 5 out of
5 by
Kole H. from
As advertised This plus the[This review was collected as part of a promotion.] As advertised
This plus the reactor compact plus was very comfortable down to about 24 degrees
Date published: 2023-04-17
Rated 5 out of
5 by
Terence M. from
Real pleased[This review was collected as part of a promotion.] Just what I needed. As the North Florida nights became cooler, this bag with the liner were perfect. And amazingly compact for carrying on the bike. Real pleased.
Date published: 2023-04-15
Rated 5 out of
5 by
David D. from
Top-performance UL Bag[This review was collected as part of a promotion.] The tall fit is perfect for me as I'm 189cm. The mummy fit is efficient, but not constricting or uncomfortable.
With the -8°c fill, it has proven perfectly comfortable at 0° this far.
The compressibility and weight was a big factor for me, and this is top for UL backpacking and bikepacking in 3 season conditions thus far. For bikepacking the back for easily in my saddlebag, and firmly in my handlebar bag.
The zipper is top-notch and given the manufacturer, I will expect no issues in the future.
Date published: 2023-04-05
Rated 5 out of
5 by
Daniel P. from
This bag is amazing. I've[This review was collected as part of a promotion.] This bag is amazing. I've used it once so far, and I love it. Very happy with how it compresses when I pack it, and it fluffs out great. Got it for bikepacking, and I love it.
Date published: 2023-03-20
Rated 5 out of
5 by
Altay Ö. from
Super Light, packs small, keeps warm![This review was collected as part of a promotion.] Amazing sleeping bag, keeps really really warm and packs super small thanks to the compression sack. As expected from a super super light product, the shell is fragile and gotta be careful not to rip it. I used it on a bikepacking and then a backpacking trip through Patagonia and never really worried about the cold.
Date published: 2023-03-15
Rated 3 out of
5 by
Corinne from
I really want to love it but I feel so crampedPros: the bag is ultralight and a dream to pack and carry
Cons: I don’t have wide shoulders but I feel so cramped in this bag. Every trip sometime in the middle of the night, I seriously consider buying a new bag when I return home but this was too expensive to give up and it’s just so incredibly light to backpack (and when you are carrying your gear plus your kids it matters). The half zip is also kind of annoying but I’d deal if I could just fit my upper body in better. and for reference, I’m not a big girl, I’m not petite but I should fit a standard size bag.
