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HomeHikingKeep Heat and Cozy with the Spark 15 Sleeping Bag

Keep Heat and Cozy with the Spark 15 Sleeping Bag

The Sea to Summit Spark Girls’s 15 Diploma Sleeping Bag is a light-weight, 3-season sleeping bag designed for girls who need consolation and high quality. My physique runs extraordinarily chilly, so my high precedence when selecting a sleeping bag is, “Will this design preserve me heat?” My second precedence is twofold: how heavy the bag is and its packability. My third precedence issues sturdiness, asking, “Will this bag maintain up over time?” I attempted out the Spark on my thru-hike of the Arizona Path, the place these three key elements of heat, weight, and sturdiness had been examined. Right here’s what I believe.

  • Temperature ranking consolation: 15F
  • Temperature ranking decrease restrict: 5F
  • Gender: Girls’s
  • Weight: 2lbs 0.8oz
  • Compressed Quantity: 8L
  • Form: Mummy
  • Insulation: Extremely-Dry Down 850+ fill energy, RDS licensed
  • Compression sack: included
  • Shell Cloth: Ultralight 10d Nylon
  • Matches Up To: 5’ 7” Common measurement, (6’ 1” lengthy measurement additionally obtainable)
  • Dimensions: (Shoulder/Hip/Toes) 55.9”/52”/36.2”
  • Execs: Very heat, light-weight, packable, sturdy
  • Cons: Slim, cosy foot field

A Sleeping Bag Engineered For Girls

By nature, ladies have a tendency to relax extra simply than males. The Spark is designed for a girl’s particular form to offer extra heat and insulation utilizing physique mapping to deploy insulation the place it’s wanted, within the foot and midsection. The form is narrower on the shoulder and widest between the hips and knees, permitting for a pure facet sleeping place. I’m a facet sleeper by way of and thru, so this labored nice for me. I change sides and wiggle at night time, although, and the broader mummy form allowed me to sleep in no matter place I wished. The down stayed lofty and didn’t get smooshed and compressed as I shifted by way of my sleep, that means I stayed toasty.

The Spark felt warm and cozy.
The Spark felt heat and comfortable.

The ladies’s Spark is shorter general, aiming to chop out lifeless house and enhance thermal effectivity. This labored effectively for me with the slim shoulder girth, particularly when utilizing the mum’s insulated collar and hood. By way of the foot field, it’s meant to reduce these nasty chilly spots on the backside of the sleeping bag by being shorter, which I might see it doing for somebody nearer to five’7”. I’m not fairly 5’5”, so I nonetheless tended to endure with that little further lifeless house. Although I discovered the foot field cosy, I nonetheless needed to stuff further garments on the backside to maintain me hotter. I can’t say it is a design downside, however it’s extra of a direct results of my top and the truth that I’m all the time chilly!

The body-mapping design for a girl’s form additionally got here into play with the additional insulation utilizing 850+ goose down. This implies the bag’s chambers are stuffed extra the place you want it most. I discovered this to be true, and I additionally famous the down felt extra lofty and puffy than another sleeping luggage I’ve used, which I consider helped to maintain me cozier. This made me really feel the standard of the Spark was excessive, and I appreciated this part.

Let me begin by saying the Arizona Path was chilly each single night time. So, I had many nights to check how the Spark fared in under or close-to-freezing temperatures. Total, I can say it did rather well, preserving me heat.

Sleeping Bag Loft and Baffles

The loft and baffles on the Spark proved to offer quality, comfort and a warmer night’s sleep.’
The loft and baffles on the Spark proved to supply high quality, consolation and a hotter night time’s sleep.

I discovered the Spark lofted extraordinarily effectively, which meant it didn’t take lengthy for the fluff to return after being stuffed. It felt fluffy virtually instantly after pulling it out of my stuff sack. The down insulation is 90% goose down, contributing to the bag’s heat.

After I began researching sleeping luggage years in the past, I had no thought what baffles had been. Baffles are these compartments working throughout the shell of the sleeping bag, they usually’re essential to preserve the insulation from clumping or shifting about. That is necessary as a result of the baffles successfully scale back chilly spots and reduce warmth loss when insulation stays in place. The Spark has full field baffle development for max heat, accommodating further down and minimizing these icky chilly spots.

The Spark’s insulation is made with the Extremely-Dry Down waterproof therapy, which may stop moisture from degrading the down. On the Arizona Path, there was quite a lot of tent wall condensation, and even on mornings when the shell of my sleeping bag was damp, I used to be nonetheless heat and guarded inside my burrito.

Draft Tubes, Draft Collar & Hood

To nix warmth loss, the Spark has a zipper draft tube (an insulated tube working alongside and behind the zipper to forestall chilly drafts from coming into and heat air escaping). I really valued the snuggly and poofy draft and neck collar, which is the insulated back and front collar across the hood. Most nights, I cocooned myself like a tightly wrapped burrito due to the cooler desert temps. I did this by tightening the draw twine, which stopped warmth from slipping out of the bag. I felt tucked in and comfortable however not claustrophobic, which nobody desires to really feel whereas sleeping.

The thick draft collar promotes warmth retention
The thick draft collar promotes heat retention.

Weight & Packability

Second to heat, the burden issue is important to what I contemplate in a sleeping bag alternative, primarily based on being a thru-hiker the place usually each ounce counts. The common measurement is 2 ½ kilos, which isn’t the lightest mannequin in the marketplace, however by far not the heaviest. This bag is barely heavier than the Girls’s Flame Fm IV, which the Spark changed. Nevertheless, Sea to Summit upgraded the zippers and internal liner, contributing to a slight weight enhance.

When contemplating packability, I selected to stuff the Spark in my trusty Sea to Summit Evac Compression Dry Bag, which I’ve had since 2016, once I thru-hiked the Appalachian Path. The Spark packed fairly effectively, however not the perfect, just because this sleeping bag is bigger in quantity and substance.

Sleeping Bag Shell and Liner

The Spark’s shell cloth is 10D nylon, and the liner is 10D (D=Denier). The Flame Fm IV had a 7D liner, which is what helped the sleeping bag keep lighter. A tad heavier liner can present extra long-term sturdiness, so I don’t thoughts this tradeout. This lining additionally good towards my pores and skin and tender.


The YKK anti-snag zipper allows for smooth sliding and no catching
The YKK anti-snag zipper permits for clean sliding and no catching

The highest enchancment I famous with the Spark had been the zippers. The Flame Fm IV used lighter YKK #3 zippers, the place the Spark makes use of the YKK #5. Sea to Summit switched to a beefier for extra of a snag-free, dependable operation. My greatest grievance in regards to the Flame Fm IV was the zippers snagging, making it robust to get out and in of my bag simply and ripping the material. So, in fact, this was the function I paid probably the most consideration to whereas utilizing the Spark for six weeks on trial. I’m tremendous happy to report I discovered the zippers clean to make use of with no issues, by no means as soon as catching.

Size & Sizing

A related level to make is that I’m about 5’5”, so the common measurement works greatest for me, being fitted to ladies as much as 5’7”. There’s a lengthy measurement for girls as much as 6’ 1”, however for those who’re taller than that, this wouldn’t be the perfect alternative for you. Additionally, remember to have a look at the specs at a look above to contemplate your individual fantastically distinctive and particular person physique form (do you will have wider shoulders or hips, for instance) to see if the sizing of the Spark would be just right for you.

Comparable Girls’s Sleeping Luggage


I extremely advocate Sea to Summit’s Spark Girls’s 15-Diploma Sleeping Bag for any girl who values a bag that emphasizes heat, mild weight, and sturdiness. It’s a stable choice for chilly sleepers like me, and it dealt with effectively for these freezing and close-to-freezing nights within the desert. In the event you hike arduous and need to sleep arduous, too, the Spark is a stable alternative for a top quality sleeping bag engineered for girls


Disclosure: Sea-to-Summit donated a bag for evaluate.

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Concerning the writer

Heather Daya Rideout has been a life-long outdoorswoman. Her pursuits and fervour for mountaineering and tenting have taken her around the globe for a lot of long-distance journeys; resembling backpacking in Nepal, India, South America, Morocco, Europe, and North America. Heather has hiked the Appalachian Path, the Pacific Crest Path, the Colorado Path, the Arizona Path and a route of 1,500 miles combining a number of Camino routes by way of Spain and Portugal. On any given day she would somewhat be open air than anything and her way of life is a direct reflection of that deep love affair with nature. Heather presently lives in Idaho and she or he’s having a wondrous time experiencing the sweetness it gives. You possibly can learn a few of her different writing at Contently.com.

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