How to Choose Sleeping Bags for Backpacking
Sale Ends Sep 1
Sea to Summit Spark 45F Down Sleeping Bag - Women's
Sale Ends Sep 1
$261.69 – to $284.19Save up to 25%
Built for women who want minimal weight but maximum comfort, the women's Sea to Summit Spark 45F sleeping bag is filled with 850+ fill-power down, and the 10-denier shell keeps moisture out.
Key Details
Fill
850+ fill-power goose down
Weight
Regular: 13.5 ounces
Long: 15.2 ounces
Compressed Volume
Regular: 2.9 liters
Long: 3 liters
Temperature Rating (F)
45 degrees (F)
- Women-specific shape and body mapping result in warmth and comfort without the weight
- Women-specific fit: narrower at the shoulders (for reduced weight) and wider between the hips and knees to allow for a natural, side-sleeping position
- RDS-certified, 850+ fill-power goose down with a non-PFAS Ultra-Dry down treatment for maximum thermal performance
- Ultralight, breathable 10-denier nylon liner and a 10-denier shell with a non-PFAS durable water repellent (DWR) provide comfort and shed moisture
- Hood and footbox have a highly water-resistant, breathable fabric for extra moisture protection
- Technical hood and zipper draft tube prevent precious warmth from escaping
- Hood and anatomically shaped footbox provide excellent warmth retention without the claustrophobic feel of some ultralight bags
- Sewn-through baffle construction for lighter weight
- YKK #5 zippers with zipper plow provide reliable, snag-free operation
- Half-length zipper for ultralight packability
- Stuff sack included
- Sea to Summit Guarantee is offered for the lifetime of this product
Imported.
Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.
Each bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
View all Sea to Summit Backpacking Sleeping BagsEach bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
| Best Use | Backpacking |
|---|---|
| Tested Lower Limit | 39 degrees (F) - ISO |
| Tested Comfort | 45 degrees (F) - ISO |
| Temperature Rating (F) | 45 degrees (F) |
| Temperature Rating (C) | 7 degrees (C) |
| Weight | Regular: 13.5 ounces Long: 15.2 ounces |
| Ultralight | Yes |
| Shell | Nylon |
| Zipper Location | Right |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 850+ fill-power goose down |
| Fill Weight | Regular: 7.1 ounces Long: 8.1 ounces |
| Sleeping Capacity | 1-person |
| Lining | Nylon |
| Sleeping Bag Shape | Mummy |
| Fits Up To (in.) | Regular: 66 inches Long: 72 inches |
| Shoulder Girth (in.) | Regular: 55 inches Long: 59 inches |
| Hip Girth (in.) | Regular: 55 inches Long: 59 inches |
| Stuff Sack Size | 9.4 x 5.9 x 3.9 inches |
| Stuff Sack Volume | 3 liters |
| Compressed Volume | Regular: 2.9 liters Long: 3 liters |
| Gender | Women's |
| Sustainability | Down certified to the Responsible Down Standard (RDS) |
Buying Advice
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Customer Images
heatherw539
Buy it immediately
1 year ago
[This review was collected as part of a promotion.] This sleeping bag is amazing! It is extremely warm and will keep you toasty on those cold nights outdoors. It fit me perfect with some extra room with a height of 5ft. It is on the larger side and they give a small bag to pack it in which is very difficult to get it in. They also include testing results on the down goose and duck feathers they use to insulate it. Definitely worth the buy!
Originally posted on influenster.com
bigheadd
So freaking cozy
1 year ago
[This review was collected as part of a promotion.] I’m so ready for a camping trip. I just can’t wait to use my new spark down sleeping bag for women by sea to summit. It’s the most snuggly sleeping bag I’ve ever experienced. It has such a soft down insulation that will keep me warm in 15 degrees. I especially like the quilt lock to keep everything in place! I so very highly recommend to all females that love to camp.
Originally posted on influenster.com
zahrawins
High end experience!
1 year ago
[This review was collected as part of a promotion.] This sleeping bag is INCREDIBLY comfortable! It’s made of down goose feathers and high end. This is the first sleeping bag made for women that adequately hugged my curves and gave me a good night sleep. I packed it up with minutes and was ready to go back on my hike! Entirely worth its price point!
Originally posted on influenster.com
callyg6
Durable and compact
1 year ago
[This review was collected as part of a promotion.] This is an excellent sleeping bag that is rated for 45F. It is down insulation and is warm and comfortable. It is very light weight and it is compact. One image is it compacted to fit into a small bag. It saves a lot of space in a backpack or vehicle.
Originally posted on influenster.com
meganr428
Made for women!!
1 year ago
[This review was collected as part of a promotion.] I love how lightweight and compact this sleeping bag is. Not only does it keep me warm, but it is also extremely comfortable. It is important to me that I have a sleeping bag that is made for women because some things aren’t meant to be “universal”. It shows there was time and effort put into making a high quality product that will not only fit and keep me warm, but will provide comfort and will last for many years and adventures to come!
Originally posted on influenster.com
michellew2310
Premium Quality and Comfort
1 year ago
[This review was collected as part of a promotion.] Our family has owned several sleeping bags throughout the years but the quality of all of them combined does not even come close to the quality of this Sea to Summit sleeping bag! With a mummy shape designed for a woman, it contours to my body leaving no room for cold air to make its way inside. The zippers are snag proof and the water repelling nylon fabric is soft, smooth, and breathable. (I still plan to purchase one of their silk-blend liners to keep the bag clean inside.) It’s incredibly lightweight- easy to fold, carry, and store; perfect for backpacking. Despite its weight, the 850+ PFC free ultra-dry down fill keeps you warm in 15°F freezing temperatures. In the past, I never would have considered spending over $500 on a sleeping bag until I received this one as a gift in exchange for my review. I’ve since ordered a regular one for my hubby.
Originally posted on influenster.com
summerw114
Lightweight but warm
1 year ago
[This review was collected as part of a promotion.] Omg this is the lightest sleeping bag that I ever have. It’s even lighter than my down jacket. We tested it at our backyard for my kids home camp day. It’s really warm enough for 50-ish degrees at night. And it is a women size but definitely could fit in a teen. This would be a perfect sleeping bag for our summer camp at upper north!
Originally posted on influenster.com
tammyh92
Great Sleeping Bag
1 year ago
[This review was collected as part of a promotion.] This Summit brand Spark Down sleeping bag was the perfect fit for me! I took it on a camping trip and was nice warm and cozy all night long. The only down side to this is getting in or out and being cold again. I would choose this product again.
Originally posted on influenster.com
kmcnamara
Comfortable, and very light weight
1 year ago
[This review was collected as part of a promotion.] This sleeping bag is so soft and light weight, it would be a perfect sleeping bag to take camping in the late spring and summer or backpacking. It’s the perfect sleeping bag for my size, I’m about 5’3 and 170 lbs. It’s snug and warm as well, but I have yet to use it outside of just testing it at home, I’m very excited to take this with me when going camping this year though!
Originally posted on influenster.com
zarachristine
Amazing in every way!
1 year ago
[This review was collected as part of a promotion.] This sleeping bag is amazing! It’s so soft and lightweight so very easy to hike/backpack/camp with. Despite being so lightweight the dense down feather inside of it allows for a lot of warmth! I love how it hugs my body perfectly keeping me nice and insulated.
Originally posted on influenster.com
1 - 10 of 34 Reviews